@septic: yours was obviously modded by some idiot who didn't know what he was doing, and either connected something wrong or damaged the pcb creating a cold solder joint..
@malleus: no audio from all outs.. are you getting anything from the trigger outs? seems like its something with the internal mixer section. i dont know how the signal path runs inside an 808, but obviously sounds go to a central mixer point and then either to the individual outs or the mixed out. otherwise you couldn't loose everything.. try to find this area on the schematics, then start resoldering in that area..
my 909 did the opposite, sounds were okay but the sequencer was completely jammed. resoldered the sequencer board, had to give it a reset to clear out the old corrupt data, and it worked flawlessly again..