As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTING SYSTEM BATTERIES COMPLETELY DISCHARGE OVERNIGHT. THE SYSTEM WORKS FINE AFTER A FIVE MINUTE OF CHARGING ON APU POWER. CHARGED EMERGENCY BATTERY. PERFORMED OPS CHECK OF EMERGENCY LIGHTING SYSTEM IAW AMM 33-50-00. OPS CHECK GOOD.