What was found
(CAN) CREW HAD ENGINE POWER SET TO 90 PERCENT FOR TAKEOFF. JUST AFTER ROTATION, NR 2 ENGINE POWER STARTED TO ROLL BACK. CREW KEPT ADVANCING POWER LEVER AHEAD UNTIL THEY HIT THE STOPS BUT IT MADE NO DIFFERENCE. NR 2 ENGINE PARAMETERS STILL KEPT ROLLING BACK GRADUALLY AND STABILIZED AT 60 PERCENT TORQUE. ONCE CREW HAD TRIMMED AND CLEANED THE ACFT FOR CLIMB, THEY CYCLED THE NR 2 ECU SWITCH TO MANUAL, NO PARAMETER CHANGE. PUT IT BACK TO ECU MODE, STILL NO CHANGE. RESOLVED ON W/O: 337646 TASKCARD: NR-00001, T/S CARRIED IAW MM FAULT ISOLATION, NO POWER RESPONSE WHEN MOVING PLA 72-00-01. BLANK OFF PY LINE AT OVERSPEED GOVERNOR END. GROUND RUN CARRIED OUT, ENGINE RAN NORMAL NO POWER LOSS. FOUND PROP O/S GOVERNOR AT FAULT. PROPELLER OVERSPEED GOVERNOR AND PCU PUMP CHANGED IAW MM 72-01-50. 721659 LEAK AND FUNCTION CHECKS CARRIED OUT. GROUND RUN SERVICEABLE. UNIT SENT FOR REPAIR TEARDOWN REQUESTED.