As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING AN ANNUAL INSPECTION, FOUND AFT BULKHEAD OF THE LT WING TIP TANK ASSY. CRACKED THROUGH FROM APPROXIMATE CENTER OF THE IB LIGHTENING HOLE HORIZONTALLY TO THE BULKHEAD IB EDGE. CRACKED AREA IS ADJACENT TO AFT ATTACH POINT FOR THE TIP TANK ASSY. AIRCRAFT HISTORY THIS AREA UNKNOWN; MAY HAVE POSSIBLY BEEN CAUSED BY PREVIOUS GROUND MISHANDLING OR (HANGAR RASH) TYPE INCIDENT. (K)