As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN REPORTED THAT DURING DESCENT, THE LEFT ENGINE OIL INDICATION LIGHT TURNED ON AND 3 QTS WAS SHOWN. MAINTENANCE PERSONNEL PERFORMED LEFT ENGINE LEAK CHECK IAW AMM 71-00-00-700-823, TESTS 3A AND 3B, DETECTING OIL LEAK IN INTERFACE TRF DISCHARGE TURBINE; SO THE TRF DISCHARGE TURBINE INLET COVER GASKETS AND O-RINGS WERE REPLACED IAW AMM 72-56-00 AND LEFT ENGINE WAS TESTED IAW MM 71-00-00, TESTED CORRECT.