As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6202 RDU-JFK EMERGENCY LIGHT ROW 13 AND AFT CAME ON WITH EMERGENCY LIGHT SWITCH IN OFF AND EXTERNAL POWER REMOVED. ACCOMPLISHED FIM TASK PER 33-50-00-810-812-A AND FOUND NR 4 EMERGENCY POWER UNIT TO BE FAULTING (SHORTING). REMOVED AND REPLACED UNIT PER AMM 33-50-01. ACCOMPLISHED TEST OF UNIT 33-50-01, OPS CHECK OK.