What was found
AT AROUND 10000', NR 1 ENGINE POWER SURGED & ENGINE INDICATION CAUTION, NR 1 TORQUE INCREASED TO APR 110 %, DROPPED TO 68 %, NR 1 PEC CAUTION, NR 1 PROP OVERSPEED, 1060 RPM ENG MESSAGE. C/W EMERGENCY ABNORMAL CHECKLISTS. SHUTDOWN NR 1 ENGINE. CONDITION LEVERS TO 850 RPM AT ABOUT 2500' MSL. APPROXIMATELY 5 MINUTES ELAPSED BETWEEN T/O CHECKLIST & NR 1 PEC CAUTION. RETURNED TO FIELD. LANDING UNEVENTFUL. INTEROGATED CDS & FOUND FAULTS FOR NR 1 ENG 260A & 236B. C/W FIM TASK FOR BOTH. C/W AMM TASK'S FOR BOTH OVERTORQUE AND OVERSPEED INDICATIONS. REPLACED PECU, PCU, BETA FEEDBACK TRANSDUCER, AND THE PECU WIRING HARNESS. C/W ENGINE RUNS IAW TC 6710006. NO DEFECTS NOTED. RETURNED TO SERVICE.