What was found
IAD/EWR - FLT 6150 - DURING CRUISE ON 3-20-97, EXPERIENCED RT ENGINE OIL PRESSURE INDICATION FLUCTUATION AT APPROX 20-40 PSI. ACFT DIVERTED PHL WITH NORMAL LANDING. MAINT T/S AND INSPECTED THE ENGINE OIL LEVEL AND FOUND IT OK. MAINT PERFORMED ENGINE RUNS AND NOTICED THE INDICATOR FLUCTUATING O-40 PSI AT GROUND IDLE WITH NO OIL CAPTION LIGHT ILLUMINATION. MAINT ALSO SWAPPED INDICATORS TO ENSURE THE PROBLEM WAS AN INDICATOR ONLY. MAINT THEN OPENED A DEFERRED MAINTENANCE ACTION ITEM UNDER MEL 79-3, CAT 'C'. DMI COUPON NR IS 04085. MAINT CLOSED DMI 04085 ON 3-22-97 BY REMOVING AND REPLACING TRANSDUCER, OPS CHK OK. ACFT RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)