As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL - CREW REPORTED FLAP ASYMETRY INDICATION ON APPROACH. TRAILING EDGE INDICATED 15 ON LEFT 13 ON RIGHT. FLIGHT ACCOMPLISHED GO AROUND. EMERGENCY DECLARED FLIGHT LANDED PHL WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. FOUND NUMBER 3 FLAP SKEW SENSOR FAULTED. REPLACED SENSOR. SYSTEM GROUND CHECK NORMAL OPERATION.