Trace the board from the wire that supplies constant power?
Havn't had the time, the other issue I face is that the PCB is semi-permanently attached.. has little plastic bits that hold it to the rest of the housing that prodtrude through the PCB and are then melted to hold it fast.. not sure I can be farked pulling it apart any further myself, might take it to one of those places that deal with gauges and clusters etc and see if they are able to work any magic on it.