I have bought an amplifier Adcom GFA 7807 (ex-demo, ebay auction). One channel does not work.. the thermal protection led is on.. With instructions of Adcom service (very friendly!!), i have controlled the fuses.. OK! the fuses is working.. But.. with lateral panels removed and bottom plate separated from boards... all the channels work well !!!!!! I have mounted the panels.. and... LEFT Front channel does not work!! Thanks Stefano Italy P.S.: sorry for my poor english..