As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS WILL NOT COME ON WITH FLIGHT ATTENDANT OR COCKPIT SWITCH, BOTH SWITCHES WERE OFF WHEN CREW ARRIVED. FOUND TO BE EMER LIGHTS DISCHARGED DEFER IAW MEL 33-32. R & R EPSU BATTERY PACK AT FWD AVIONICS BAY IAW AMM 33-51-17. OPERATIONS CHECKED GOOD MEL ITEM RESTORED.