As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON INSPECTION, LEFT SUPPORT ON EXHAUST CROSS-OVER HAD MISSING ATTACHING HARDWARE. FOUND BROKEN BOLT SHANK AND NUT IN FIREWALL FLANGE PARTIALLY PAINTED COLOR OF AIRCRAFT (WHICH MEANS BOLT WAS BROKEN AT FACTORY INSTALLATION PRIOR TO PAINTING). NO RECORD OF COMPLIANCE WITH LYCOMING SB 512 (EACH 200 HOURS). LYCOMING SB 512 RECENTLY REPLACED WITH SB 521. BOLT PN LW25150.