As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ANNUAL INSPECTION, LEFT WING OUTBOARD AUX FUEL CELL LEAKAGE NOTED. UPON INVESTIGATION, FUEL CELL FOUND TO BE SERIOUSLY DETERIORATED AROUND THE FILLER PORT OPENING. THE FUEL CELL MATERIAL AT THAT POINT HAD BECOME BRITTLE. SUGGEST THOROUGH EXAMINATION OF FUEL CELLS CONDITIONS DURING ALL SCHEDULED INSPECTIONS.