What was found
DTW - FLT 2907 - WHILE EN ROUTE AT 11,000 FT LEFT ENGINE PROPELLER GEAR BOX OIL TEMP FLUCTUATED OUT OF GREEN ARC INTO YELLOW ARC ALMOST TOUCHING RED LINE. GAUGE FLUCTUATED BETWEEN LOW GREEN ARC AND RED LINE. MAINTENANCE REPLACED LEFT PGB OIL TEMP BULB, IAW GEMM 72-00-00 AND LEFT PGB OIL PRESSURE SENSOR IAW SAAB AMM CH 79. PERFORMED GROUND RUNS AT VARIOUS POWER SETTINGS. ALL PARAMETERS NORMAL. SECURITY AND LEAK CHECKS GOOD. (M)