As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FA REPORTED THE EMERGENCY LIGHTS FLASHED ON AND OFF THE ENTIRE FLIGHT. CORRECTIVE ACTION: R/R L AFT EPSU AND BATTERY PER A320 AMM 33-52, L AFT EPSU BATT FAULT CLEARED, EMERGENCY LTS OPS NML. FOUND INOP BULB IN RIGHT WING AFT OVERWING EXIT LIGHT HOUSING. RELAMPED BULB AND RAN OPS CHECK PER A320 AMM 33-51. OPS CHECK GOOD. FAULT NO LONGER EXIST.