As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: AFT LEFT EMERGENCY POWER SUPPLY UNIT FAULTING WHILE ACCOMPLISHING TEST OF THE EMERGENCY LIGHTING SYSTEM AT THE L2 DOOR. REPLACED L2 DOOR SLIDE PER JOB CARD 26L00025011 AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK.