What was found
AIRCRAFT RETURNED TO PLATFORM, "RT ENGINE STRAINER CLOGGED" LIGHT TURNED ON. DIFFERENTIAL PRESSURE ALARM LINES LP5 AND LP6 WERE CLEANED AND OIL FILTER WAS REPLACED IAW MM 79-20-06, TEST CORRECT. DURING OVERNIGHT SERVICE, OIL AND OIL FILTER WERE REPLACED IAW MM 79-20-06 AND DIFFERENTIAL PRESSURE SWITCH WAS REPLACED IAW MM 79-35-01, TEST CORRECT.