As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: WHILE PERFORMING EMERGENCY POWER SUPPLY UNIT BATTERY TEST PER JOB CARD 26L00005005, ESCAPE SLIDE LIGHT 13WL AT DOOR 4L FOUND FAULTED VIA CLASS 1 MESSAGE. REMOVED AND REPLACED L4 DOOR ESCAPE SLIDE PER JOB CARD 26L00025010.