As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: DURING AN OPERATIONAL TEST OF THE EMERGENCY LIGHTING SYSTEM ON CIDS 1, A FAULT MESSAGE FOR EMERGENCY POWER SUPPLY UNIT 10WL DISPLAYED. MAINTENANCE CLEANED THE ELECTRICAL CONNECTOR FOR THE EMERGENCY LIGHTING SYSTEM ON THE R1 DOOR SLIDE AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 33-51-00.