Hi, I got a couple of questions. My mechanic found a leak in the evaporator using a fluorecent dye. He showed me the leak from the drainage tubes on top of the transmission . However, he also mention a "small leak in front of the compressor". He recommended to change the evaporator and convert to 134 at the same time but, he did not mentioned anything about replacing the compressor (1.5 year old). Should I replaced/repair the compressor at the same time? What is this list opinion about the performance of R134 vs R12?