As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: ALL EMERGENCY LIGHTS ILLUMINATED IN THE CABIN FROM JUST BEFORE TAKEOFF UNTIL LANDING WITH THE SWITCH FOR THE EMERGENCY LIGHT IN ARM POSITION. MAINTENANCE FOUND EMERGENCY POWER SUPPLY UNIT 11WL FAULTING AND REPLACED IT PER AMM 33 -51-00, A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.