What was found
LEFT TORQUE INDICATION FLUCTUATED PLUS/MINUS 3-4 PERCENT DURING CRUISE FLIGHT, AS POWER WAS INCREASED FLUCTUATIONS WERE LONGER. ABOUT 1-2 PERCENT AROUND 40-50 PERCENT TORQUE. NO FLUCTUATIONS ON GROUND OR TAKEOFF WITH CTOT ENGAGED. CLIMB POWER SET AND PROP AT 1270 RPM. CHECKED ALL CONNECTORS LT ENGINE ALL FOUND SECURE CHECKED OIL ADDED 1 QT LT ENGINE SWAPPED TORQUE GAUGES RAN ACFT FOUND NO TORQUE FLUCTUATION DURING RUN UP. GAUGE REMAIN SWAPPED. REPLACED LT HMU IAW GE MM 73-00-00, LEAK CHECK AND OPS TEST GOOD. NO FLUCTUATES NOTED DURING ENGINE RUN, P/N 6068T72P22 S/N ON:11432828, S/N OFF: WYG54843.