As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN HEAVY MAINTENANCE PERFORMING INSPECTION IT WAS NOTED THAT THE LT WING TANK VENT LINE IS CHAFED AT TOP OF CLAMP WBL 348.00. REPAIRED LT WING TANK FUEL VENT LINE AT WBL 348 IAW ED NR EDAG52-1. LEAK CHECK GOOD. NO OTHER DEFECTS NOTED. AIRCRAFT WAS RETURNED TO SERVICE.