As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING PERIODIC SERVICE CHECK EMERGENCY POWER UNIT SYSTEM TEST FAULTED ESCAPE SLIDE LEFT EMERGENCY POWER SUPPLY UNIT 15WL MID LEFT. REPLACED LEFT HAND FORWARD EMERGENCY EXIT DOOR (L2) SLIDE AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER TASK CARD 26L00025012.