As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CONDUCTING A "T" INSPECTION ON AN ACFT WITH AN FDC AERO FILTER ASSEMBLY INSTALLED, A CRACK WAS FOUND IN THE FIBERGLASS. THE FIBERGLASS WAS WORN ON AFT FLANGE WHERE UPPER HOUSING, PN 1350A3-1, CONTACTS LOWER HOUSING. THE LOWER HOUSING CAUSED CHAFE DAMAGE TO THE UPPER HOUSING. IF NOT DETECTED IT COULD HAVE COMPLETELY WORN THROUGH AND GONE INTO THE ENGINE.