What was found
(CAN) DURING CRUISE FLT, CREW NOTICED FAINT SMOKE SMELL, & NOTICED THAT PROP AUTOFEATHER CIRCUIT BREAKER HAD POPPED. THEY DECIDED TO RETURN TO YYC. DURING APPROACH / LDG PHASE OF FLT, SMELL OF SMOKE BECAME MORE NOTICEABLE. THE LDG & TAXIING TO GATE WENT UNEVENTFULLY. DURING MAINT INVEST. SEVERAL WIRES ON BACK OF AUTOFEATHER OFF/ON/ TEST SWITCH WERE SHORTED / MELTED. FURTHER INVEST. REVEALED SHORTED / MELTED WIRES ON POWER LEVER MICROSWITCHES FOR AUTOFEATHER, TRACING SYS FURTHER IT NOTICED THAT A123 PRINTED CCT BOARD P/N 129-364091-9 HAD BURNT TRACKS & DAMAGED COMPONENTS ON IT. ALL COMPONENTS&WIRING WILL BE TESTED/REPL, FOLL OWED BY EXTENSIVE GROUND CHECK OF ENTIRE AU