What was found
(CAN) SHORTLY AFTER TAKEOFF, FLIGHT CREW OBSERVED TORQUE FLUCTUATIONS ASSOCIATED WITH STRONG YAW INPUTS. THE ENGINE WAS SHUTDOWN AND AN EMERGENCY DECLARED. ACFT RETURNED AND LANDED WITHOUT FURTHER ISSUE. TROUBLESHOOTING REVEALED THE BETA LOCKOUT WAS ENGAGED BECAUSE OF A BROKEN WIRE AT PEDESTAL POWER LEVER SWITCH 6141-S3. THE SWITCH WAS REPLACED, ADJUSTED AND TESTED SERVICEABLE. FLIGHT DATA RECORDER WAS DOWNLOADED AND ENGINE PARAMETERS ANALYSED. ENGINE OIL SCAVENGE FILTER AND REDUCTION GEARBOX CHIP DETECTOR WERE INSPECTED AND FOUND SERVICEABLE IAW THE MM 05-50-00.