As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: WHILE PERFORMING OPERATIONAL TEST OF EMERGENCY LIGHTS FOR R2 SLIDE REPLACEMENT PER JOBCARD 26L00025012, FAULT LIGHT ILLUMINATED ON EMERGENCY POWER SUPPLY UNIT (15WL) BATTERY. REMOVED AND REPLACED EMERGENCY POWER SUPPLY UNIT BATTERY.