As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT EMERGENCY LIGHTS WERE DISCOVERED ON FROM REAR PANEL WHEN CREW BOARDED THE BATTERY CHARGING CONTROL CIRCUIT FOR THE EMERGENCY LIGHTS PROVIDES A TRICKLE CHARGE TO THE BATTERIES AS LONG AS POWER IS AVAILABLE TO THE AIRCRAFT PER SDS AMM PART I 33-51-00-022. POWER WAS CONTINUOUSLY APPLIED TO AIRCRAFT WHILE ON GROUND WITH GPU POWER. OK FOR SERVICE