Fungal disease of some kind. How often do you water and for how long? How much rain have you gotten? Are you down in a low area or has that area been covered with brush or something? It looks like it was smothered or otherwise protected from sun and wind for a time. I take an organic approach to lawn fungal diseases. I use ordinary corn meal at a rate of 20 pounds per 1,000 square feet. Corn meal attracts another fungus which is predatory on the fungus causing your disease. That fungus is called trichoderma (try ko DER mah). It takes 3 full weeks before you see any improvement. That can be the longest 3 weeks of your life, but after that you should see less yellow and much more deep green. Corn meal is also an organic fertilizer so the dark green color will be very noticeable at the 3 week point. If you have used a chemical fungicide recently, then the corn meal will not work against the disease but it will definitely green up the grass. And yes this is the same corn meal you cook with. You can get it in 50-pound bags at the feed store. And no, it will not attract varmints. Seems like it would but it does not. It does seem to attract birds but they don't eat it. They just come and visit. You can apply corn meal any day of the year, rain or shine, or every day of the year, without fear of hurting anything. If you wan to take a chemical approach, I cannot help you. Our temperatures, humidity, and rainfall are usually outside the recommendations on most chemical fungicides. I gave up on them years ago when I found out how well corn meal works. On another issue you did not ask about: You are mowing your St Augustine much too low. Raise your mower all the way to the highest setting. It will take a month or so before all the grass gets tall enough to be mowed but it eventually will. Mowing it low favors the bermuda which is mixed in with it. Mowing it high can have the effect of choking out the bermuda. Tall St Augustine looks very lush.

Thanks for the clarification and info. Seems I was eyeing up dual capacitors instead of just a single. The furnace is maybe 10-15 years old I believe. I don't have an exact age as we are only in this house about a year, and we purchased from some folks that flipped the house. I was also thinking they were just looking for an easy buck... Considering it was a year between when they first told us it was "weak" and worth replacing, until telling us the same thing again (and we've had no problems), would you guys bother replacing now? Or just wait? Might be worth it to just order the part and keep handy if/when the capacitor goes. I assume that's the first place you'd start.

http://www.jfschmidt.com/elmtrial/JFS-elm-parentage-2009.pdf. this gives you a list of possible elms to Google :) I'm pretty certain. It doesn't apprear to be a zelkova based on the bark (appears to have ridges and is not redish in color), and it's definitely not an American elm due to leaf size, etc.... I think frontier is a pretty good guess. If you could upload a clear picture of the bark that might help to rule out the ulmus parvifolia cultivators at the link. Those tend to have smaller and narrower leaves which are present in your picture.

That's what I had to do when I did this fix recently. Remove the screen, remove the stationary panel, remove the sliding panel. I then removed the rollers and determined what size to buy, but because I didn't have the time to go get the rollers that day, and didn't want to leave the opening open overnight, I reassembled the door, with the broken roller. Then a day or two later when I had the replacement, I didn't want to go through the same effort to remove the doors, I tried lifting the end of the door with the bad rollers (carefully) and used a mini-prybar and a small hammer to tap the bad rollers out of the slot. This may only have worked because I had already removed it earlier, so that it was less stuck in place.