As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEVERE INTERGRANULAR CORROSION OF MAIN WING SPAR WEB AND UPPER SPAR CAP AFT OF ENGINE FIREWALL. REQUIRES REMOVAL OF ENGINE, ENGINE MOUNT, FIREWALL. SUSPECT SOURCE OF CORROSION TO BE FIRE SHEATH INSTALLED OVER FUEL LINES BEHIND FIREWALL. SB 61 ADDRESSES INSPECTION OF FUEL LINES AND REMOVAL OF FIRE SHEATHING, WITH CORRESPONDING INSPECTION FOR SPAR CORROSION. BULLETIN IS MISLEADING, DOES NOT PLACE EMPHASIS ON SPAR. WING SPAR IS UNAIRWORTHY, FACTORY AND DER CONTACTED FOR POSSIBLE REPAIR. RECOMMEND AD FOR THIS CONDITION.