This had a blown 2SK1058\J162 (FET), a burnt up 2K2 resistor and 470ohm presets also needed replacing.
Aura Evolution VA-100 MkII
This had been pop\crackling for a while, it got worse until it expired altogether. The plugs for the +\- supplies to the amp had burned away the solder, the tracks needed repairing. Sounded fine after the repair. It uses MOSFET's for the o\p's.