As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING OIL FILTER INSTALLATION NEW O-RING SIZE FOUND INCORRECT. MFG CONTACTED TO VERIFY SEAL, P/N AND CHECK ITS DIMENSION TO MEET SPECIFICATION DATA. SEAL DIMENSION FOUND OUT OF SPEC, SUPPLIER AND MFG INFORMED. NEW BATCH OF O-RINGS ORDERED. NO DISCREPANCY`S.