As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2143 - GSP - FLIGHT CREW REPORTED THAT APPEARED TO BE A LEAK OF FUEL ON LEFT WING, CONFIRMED BY TOWER IN FLT. CREW PERFORMED AIR RETURN AND LANDED UNEVENTFULLY. EWR MX REMOVED AND REPLACED LEFT WING FLAPPER VALVE AT NACA VENT AND PERFORMED OPERATIONAL CHECK SUCCESSFUULY. ACFT WAS APPROVED TO RETURN TO SERVICE.