Re: To flush or not to flush?
As JWKO said, new filter-drier. Also, the flush would help. You may end up having to evacuate it and re-flush it in a year or two and maybe a TXV replacement. Contaminants from oxidation and moisture tend to come back to haunt you quite a bit in an AC system. If you don't have the capability to do it yourself, it might be worth considering a system replacement and bite the bullet in one shot. If you can do it yourself, don't be surprised if you have to go back in.
Chewing on asphalt and drinking dinosaur wine