What was found
NR 1 ENGINE HAS OIL LEAKING AFT OF DRAIN MAST FROM BOTH SIDES OF COWL LATCH. NO EVIDENCE OF OIL LEAK FROM ENGINE DRAINS WITH FAN COWL OPENED DURING IDLE RUN, ALSO CHECKED OIL COOLER AREA ON RT SIDE UNDER FAN COWL, EVIDENCE OF OIL LEAK AT OIL COOLER WITHIN 10 CYC OR 25 HRS FLY BACK LIMITS OF AMM MT79-007, OIL TANK CHECKED FULL, CLOSED FAN COWLS PER AMM. OIL CONSUMPTION IN NORMAL. REPLACED OIL COOLER PER AMM.