As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AS PART OF THE 600-HOUR INSPECTION OF OIL FILTER ADAPTER REQUIRED BY SEB 93-1R1, THE RELIEF VALVE SEALING 'DISK' WAS FOUND ASKEW AND NOT SEALING PROPERLY. FURTHER INSPECTION REVEALED THE SPRING THAT HOLDS THE 'DISK' IN PLACE HAD BEEN CHAFED MORE THAN HALFWAY THROUGH BY ITS SUPPORT CAGE. UNDETECTED, THIS COULD HAVE SERIOUSLY DAMAGED THE ENGINE.