What was found
LT OIL PRESSURE GAUGE READ BETWEEN 25 PSI AND 40 PSI AT 38,000 FEET. TEN MINUTES LATER OIL PRESSURE LOW LIGHT ILLUMINATED AND GAUGE READ 23 PSI. PERFORMED PRECAUTIONARY SHUTDOWN VIA CHECKLIST. FOUND OIL TO BE ORIGINATING FROM OIL SERVICING CAP AREA. REMOVED OIL CAP AND FOUND 1/2 INCH SECTION O-RING REMAINING IN STAND PIPE. REMOVED 1/2 INCH SECTION OF O-RING. INSTALLED NEW O-RING, SERVICED ENG OIL 5 1/2 QTS OIL. WASHED AREA. LEAK AND OPS CHECKED GOOD MM 79-10-02.