As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: EMERGENCY POWER SUPPLY UNIT 1OWL, FORWARD LEFT / DECODER ENCODER UNIT B (300RH1) FAULT DISPLAYED DURING SYSTEM TEST. MAINTENANCE REPLACED THE L1 DOOR SLIDEAND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK OF THE EMERGENCY LIGHTING SYSTEM WITH NO FAULTS NOTED PER TASK CARD 26L00025011.