If you got the time, take the money. I would not add TXVs. Guess they
all run on r22. Fix what they need, and let them be.
I worked one summer at a apartment complex many years ago, and they
were the same way (all apartment complexes usually are). They hired
me to assist their maintenance tech, who was a nice guy, but did not
know s**t. I was young at the time, and contracted with them, they
paid me by what part was changed, plus a flat fee for each day.
We went throught something like 120+ units. We replaced about 25+
compressors. I ended up having them as a customer for a few years
after that until the complex was sold. New owner did not want to pay
any $$ at all, so by by.