Emax

Dear list,
i just installed a new psu on an emax rack (thanks JeanMarc!) and i'm 
testing it.
it works but voices are missing.
another flaw, the most annoying, it is some notes get stucked requiring 
a panic button push. it is totally unplayable
After running the ERAM test in the diagnostic menu, it says error 
detected caused by IC35. sometimes it says IC??
Do someone know which IC is the one number 35?
I guess i can just  open up the machine,  IC numbers should be written 
on the board, anyway:  any suggestion?

thanks!
da vi de