What was found
(CAN) DURING COMPLETION OF AUTOFEATHER TEST, FLIGHT CREW NOTICED THAT THE NR 2 PROPELLER WAS NOT FEATHERING. ACFT WAS TAXIED BACK TO THE GATE AND REMOVED FROM SERVICE. DURING TROUBLESHOOTING, ELECTRICAL WIRE 6121-61D20 WAS FOUND BROKEN BETWEEN CONNECTOR 6121-P8 AND TERMINAL BLOCK 9811-TB160/2G. DURING INSPECTION OF THE WIRE BUNDLE, WIRES 2921-10002B18A-1 AND 2921-20006C18C-1 WERE ALSO FOUND BROKEN. THE BROKEN WIRES WERE LOCATED AT A CLAMP ON THE WING REAR SPAR NEAR THE WING ROOT. WIRES WERE REPLACED AND ASSOCIATED SYS TESTED.