EF81... Is it repaired?
 

Hello! I bought a used EF81. It has a big problem with its reception (can loose the signal while switching cells and it has very bad reception in a five bar place)

I opened it and found out that most of the pcb insulation is missing (mostly around qualcomm chips). Checking the service manual seems that all these insulations should be there.

Do you now if there was a revision with less insulations? I flashed the phone and still won't get good reception...