"amp err" pioneer 1015s

[mzone]

got a pioneer vsx 1015s  on power up get a error "amp err"

i have located the right assembly board as the culprit.

i cant seem to trace the fault, i check and removed the main fets but they all measure ok. ( amp still going into protection mode even with fets removed )

done a quick test on the board but everythink seems ok.

anyone advize.