As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SCHEDULED INSTRUMENT AIR FILTER REPLACEMENT, FOUND THE PLASTIC COVER (SHROUD) P/N 0814552-1 FOR THE FILTER WAS INTERFERING WITH AND PREVENTING THE FILTER GASKET FROM SEALING COMPLETELY. TRIMMED INNER EDGES OF FLANGES TO ALLOW COMPLETE GASKET SEALING.