As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUE TO FINDING OF CARBON BUILD UP ON MAIN OIL FILTER NEED TO ACCOMPLISH AMM. EXAMINED LT ENG CHIP DETECTORS AND MAIN OIL FILTER. NO CHIPS FOUND. REPLACED MAIN OIL FILTER AND LEAKED CHECKED. NO LEAKS FOUND. ACP AMM FOR LEFT ENGINE. LEFT ENGINE RUNUP AND LEAK CHECK OKAY.