They're tough plants which should do fine without intervention. So I suspect something is wrong in its environment. Perhaps it's in a pot rather than the ground; and/or poor drainage; and/or too much water; and/or too little sun. Beyond that, if it's in a pot and has mealybugs, have you looked at the rootball? If you find whitish smudges, the plant has root mealybugs. Discard plant. If you'll keep the pot, clean thoroughly.

You have a jade, aka, crassula ovata. It is in desparate need of light. Was this where it was when you moved in? If so, do you have a balcony on which you could slowly acclamate it when the outside temps are above 55 or so consistently. If you just moved it to this spot and it is better-lit than where it was, these could be sunburn marks. Typically sunburn marks are more uniform in shape, though. It should have about 1/5 the amount of space it has between the leaves. It almost looks like it is supposed to be a Crosby's Compact which should have all the leaves very close together with proper lighting. Jade grows spindly when it isn't getting enough light. I would take it out of the plastic pot and repot it in a clay pot. Buy one that is shorter. THey are sold as azalea pots. Your soil should be very free draining. When I mix mine, I use one part pine bark fines or soil conditioner, one part grit (decomposing granite), one part high fired clay granules (turface, aquatic soil), and one part small pea gravel. When you water it, water should run almost right through it. If you use peat based soils, they will compact and stay too wet, thus strangling the plant due to lack of oxygen. Even the soils that say they are for Cacti and Succulents are too peaty. You could also try coir inplace of the pine bark fines or in addition to them in place of peat. Almost anything you would use for a bonsai would be okay for a jade since they are very free draining. They don't need a lot of fertilizer. Use something low in nitrogen. I use Schultz Cactus Fertilizer mixed for every watering, but I only give it to them every other watering during their growing season. It is warm where I live until Oct or Nov, which is usually when I stop feeding and slow down watering to once a month until it warms up again in spring. We were warming up in March and then had a frigid spell over Easter holiday. I've gone back and forth with my plants, but having a mild spring has been nice for a change. I hope this helps, and don't hesitate to ask more questions. Do searches on this forum about Jades, and you'll get more than you ever wanted to know about jades. They are, without a doubt, my favorite. I have about 10 different plants, 10 starts from cuttings and two that are bonsaied.

They can be purchased at the Huntington Gardens, so why steal them. Jeff, run, I am we are going to be tared and feathered. My list is growing longer, or people who I don't invite to the Huntington or my house and who I send out plants to. I am running as fast as I can. I don't want you to come to my Huntington Garden either. Jeff you are always welcome here, you are honest gentleman. Norma

" I would attack’s it with a sponge at least to see if you can clean that up." You do that and you own the entire thing, make him clean it up better. Sooner the better as grout hardens over time. Also as alluded to above he needs to remove the grout at all chnages of plane and use 100% silicone caulk.