What was found
DURING CRUISE FLIGHT, AIRCREW NOTICED NR1 AND NR2 ENGINE TORQUE INDICATIONS FLUCTUATING 5 TO 10 PERCENT. IAW PROCEDURES, THEY IMMEDIATELY STARTED AN EMERGENCY DESCENT AND MADE A DIVERSION FOR AN EMERGENCY LANDING. GROUND MX CREW PERFORMED ENGINE RUNS AND COULD NOT DUPLICATE THE NR1 AND NR2 TORQUE FLUCTUATIONS DISCREPENCY, HOWEVER, THE NR 2 OIL PRESSURE CAUTION LIGHT ILLUMINATED. THE NR 2 OIL COOLER WAS R & R, PERFORMED GROUND MX RUNS, AND NR 2 ENGINE OIL PRESSURE LIGHT ILLUMINATED. GROUND CREW THEN FOUND THE NR 2 OIL PRESSURE TRANSDUCER LINE LOOSE, THEY RETIGHTED THE LINE, PERFORMED GROUND RUNS, AND SYSTEM PERFORMED SATISFACTORY. ACFT RETURNED TO FLIGHT STATUS.