As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: MAINTENANCE PERFORMED A SCHEDULED REPLACEMENT OF THE L4 DOOR SLIDE AND DURING THE POST INSTALLATION FUNCTIONAL CHECK EMERGENCY POWER SUPPLY UNIT 13WL WOULD NOT TEST. MAINTENANCE DETERMINED THAT THE REPLACEMENT SLIDE WAS BAD FROM STOCK AND RE-INSTALLED THE PREVIOUSLY REMOVED SLIDE AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER TASK CARD 2600025011.