What was found
PDIS 574 79-32 8368 08JAN19 LAX OPEN U LOGPAGES:3074658 ON CLIMBOUT PASSING FL 300, NOTICED NR 3 ENG OIL PRESSURE LOW, IN YELLOW, 22 PSI. NR 1 PSI WAS 55, NR 2 WS 54. TALKED TO MOCC & GOCC & DECIDEDTO RETURN TO LAX. RAN NR 1 AND NR 3 ENGINES AT DIFFERENT POWER SETTINGS, NR 3 CONSISTENTLY LAGGED NR 1 ENGINE 4-8 PSI. REMOVED AND REPLACED NR 3 OIL PRESSURE TRANSMITTER IAW AMM 79-33-01-4-1, LEAKS AND OPÏ¿½S CHECK GOOD. RAN ENGINE A DIFFERENT POWER SETTING, OIL PRESSURE WITHIN NORMAL OIL PRESSURE ENVELOPE PER JRH CHAPT 4.