Fujitsu split system problem

Hi,
I have Fujitsu split air condition system from 2003. year, 3.5 kW. One month ago inside unit start to freeze and I call engineer. He fill the system with R22 gasoline. It was missing about 50%. Few days later freezing happen again, and he come again and fill the system again. After that he found that at inside unit, at connection, gasoline leak. He fix that and instead of R22, he fill with R407. After that problem with outside unit start.
When I turn on unit, compressor start to work for 5 minutes, and then turns off. Fans are turning anyway both on inside and outside unit. After maybe 10 minutes, compressor starts on again, and again work for 5 minutes and then turn off. While compressor is running, cold air come from inside unit.
Engineer said that my compressor is bad and I have to buy new air condition system because is not profitable to buy compressor because is expensive.
He didnt check nothing on outside unit. Just say that is compressor according just to his experience.

My question here is if is possible that some other part is bad?

Thanks in advance.