High DC offset on DH-220

[schubert]

Hellpp!! I just finished replacing everything on the driver boards (except resistors and a few caps) of my Hafler DH-220. In a rare fit of prudence I checked the DC offset before hooking up speakers, and while the left channel was fine, the right channel had 62V (no, that's not a typo)!!! So I guess all 62V from the power supply is getting to the output somehow - but nothing was smoking, and (unlike the left channel) the output mosfets were cold. Any ideas on how to proceed?

 

[schubert]

Found the main problem - bad solder joint - but now the offset is still high (24.5mV) with the pot pinned to one side. Can anyone tell me which transistor affects the offset? I have extras and can replace the offending part with one of a different hFe.