As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN PREPARING FOR A ENGINE CHANGE THE INSPECTOR WAS CHECKING ALL FITTINGS LOCATED ON THE FIREWALL. THE FUEL CONTROL, FUEL RETURN LINE BULKHEAD FITTING AN833-4D WAS NOTED TO BE LOOSE. WHEN THE FITTING WAS REMOVED IT WAS DISCOVERED TO BE CUT ALMOST IN HALF, DUE TO THE STAINLESS MATERIAL OF THE FIREWALL CUTTING INTO THE FITTING WHILE THE FITTING WAS LOOSE.