What was found
(CAN) A/C DEPARTED WITH A 13,000 LB LOAD OF LOGS, COLLECTIVE WAS LOWERED TO DECREASE ENGINE POWER. CREW HEARD A SWOOSH SOUND & NR 2 ENG N1 UNDER-SPEED WARNING SOUNDED & WARNING LIGHTS ILLUMINATED INDICATING A SOFT STALL. JETTISONED LOAD AND EXECUTED INFLIGHT SHUTDOWN AND MOTORING OF ENG TO PREVENT OVERTEMP. NR 2 ENG SHUTDOWN COMPLETE, A/C MADE AN UNEVENTFUL SINGLE ENG LANDING. COMPLETE INSPECTION OF ENG & CONTROL LINKAGES REVEALED NOTHING ABNORMAL. ENGINE FUEL FILTER WAS INSPECTED FOR CONTAMINATION. ENGINE FUEL CONTROL UNIT & THE FUEL PRESSURING AND DUMP VALVE WERE CHANGED. ENGINE WAS RESTARTED AND GROUND RUN TO CHECK ALL ENG OPERATING PARAMETERS. ALL PARAMETERS WERE OK AND A/C WAS RELEASED FOR FLIGHT.