What was found
DURING ANNUAL INSPECTION, IT WAS DISCOVERED THE UPPER ENGINE MOUNT TO FIREWALL BOLTS HAD INSUFFICIENT TORQUE DUE TO THE FIREWALL INSULATION COMPRESSED BETWEEN THE INTERIOR TUBULAR STRUCTURE AND THE FIREWALL. THIS IDENTICAL CONDITION IS ADDRESSED IN AD 2007-05-04 AND SB M20-292A. THE AD AND SB APPLIES TO CERTAIN SN OF THE SERIES AIRPLANES, BUT NOT TO THE THIS SERIES, WHICH IS OF SIMILAR DESIGN. CORRESPONDED WITH MFG TECH REP BY EMAIL OF THE SITUATION, AND CORRECTIVE ACTION WAS TAKEN BASED UPON THE EXISTING AD & SB.