The first few pictures wouldn't concern me (certainly not to the point of replacing all the boards), but I would ask to replace the board/s in your last pic. It looks like the wood is warped, anyway. That must be a hot spot for water drainage.

Home Probe--in letting it dry out, wouldn't the mold (or some of it) still be alive? I am wondering about spraying with bleach or something to salvage some of the wood and avoid ripping out windows etc.?

it hasnt rained here in like 8-9 days, but I guess the moisture was festering in between the wrap and the plywood

I'd certainly spot treat it before applying more house wrap. Just keep in mind: there are mold spores all around all of us all the time. There were mold spores on the wood when it was first installed and they just grew in the favorable, moist conditions. A proper house wrap will breathe, so dampness should be less of a problem (but what you put over the house wrap could make it breathe less freely).

I'd definitely treat it with a bleach solution. "Scrub the surface mold stains from walls and wood trim with a mixture of 1 qt. water and 1/2 cup bleach to kill the mold. Use a soft brush and work until signs of the mold disappear. Wipe off, but DO NOT RINSE these surfaces. Set [item] in direct sunlight to dry." https://www.familyhandyman.com/cleaning/mold-and-mildew/...remove-mold/view-all

I'd also look carefully for any root cause that might still be present.

Give that a topical treatment, let it dry, Tyvek, and forget about it.

Patricia yes I hear ya, we had a bad set crew that didn't make it watertight, and due to other circumstances (bad snowstorm day after the set, excavator doing an overdig, etc.) we were unable to get it sided until now, unfortunately. Just bad timing. We have had so much bad luck...

qam999 I appreciate the advice. Had a mold guy come out today from ServiceMaster, he said bleach will make it dormant then in the future it could come back 10-fold (could he also be saying that so that we spend tons of money using him to remediate? possibly). Just wanted to mention what he said incase you had heard this before... Because that was my first thought-spray bottles, bleach and ladders :/

bear with me while i talk about mold. it is insidious. our youngest daughter started having vision problems, headaches, nausea. a trip to the doctors showed elevated liver and white cell blood numbers. the doc asked me if she was exposed to mold. when i checked behind the sheet roc in her bedroom in our 1880's farm house it was covered in black mold, right next to the head of her bed. 15 years later she is still sensitive to mold and living in south Florida developed the same symptoms from an apt she rented. mold duplicates in a circle and when it gets started it grows quickly, the least little speck will grow, and IT grows every where. check everything under the wood, wear a mask, gloves, clean suit. replace the black sections shown in the last picture, those are really scary. seriously this is nothing to mess with. good luck.

Bleach will kill mold and mildew. Not make it dormant.

"Bleach will kill mold growing on non-porous surfaces like glass, tiles, bathtubs and counter tops. However bleach cannot completely kill mold growing in non-porous materials like drywall and wood. Bleach does not penetrate into these non-porous substances and so only the mold growing above the surface is killed."

More here.

Mold is everywhere, and it needs oxygen, water, and a food source (cellulose) to grow. The picture doesn’t look as bad as most. Clean the surface and apply a nonporous paint to encapsulate it. The chances of something like this causing an indoor air quality problem are near zero. You’re bringing in more spores through your front door than are migrating through the OSB, insulation, and drywall at this location.

Everyone reacts differently to mold, which is why there are no airborne standards by the EPA and no OSHA exposure limits. I could bathe in thousands of spores, whereas you could breathe in one spore you are sensitized to and have an allergic reaction.

As someone who works in the industry and also owns a side business for occupational safety/industrial hygiene, I can assure you that many companies take advantage of consumers with regard to mold. It is the new asbestos, and a lot of money can be made. It is unfortunate since many people are simply uneducated on mold. The color of mold is often dictated by what it is consuming. Black mold can be a variety of species, not necessarily stachybotris.

When you find mold, clean it or remove it If it can’t be cleaned. Fix the water source. Drink a beer.

For sensitized populations, you may need to go further and introduce engineering controls like HEPA filtration and keeping the home positive in pressure to the outside. For 99% of people, this is overkill.

Great advice, I agree with you. If you see mold, you should get rid of it. And if you can't do it yourself, you can call specialists and they will help you. Mold can cause serious respiratory system health issues, it also spreads very quickly, so you should remove it as quickly as possible. Well, I had this problem in one of the rooms. I noticed an unpleasant smell in the room and didn't know the reason for it. Then I started having trouble breathing. A neighbor suggested that it was mold, but I didn't see any traces of mold anywhere, nevertheless I decided to call a local mold removal company to find out what the problem was. They lifted the parquet and found mold under it. The neighbor was right. I'm glad we found the source of the problem and were able to solve it.