I'm interested to see if you will be able to repair your vfd as I also have a similar one with the same problem, but I have some more damage on the PCB. My IGBTs are the Fairchild FGA25N120, possibly the more expensive ones but not sure what's the difference between the two. Anyway I wanted to let you know that on exactly the same PCB, the Chinese fitted these IBGTs in my unit. No sure if it helps..