As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: OPERATIONAL TEST OF EMERGENCY LIGHTING SYSTEM FAILED AFTER RIGHT HAND OVER WING EXIT SLIDE REPLACEMENT. MAINTENANCE DETERMINED THAT THE R1 DOOR SLIDE WAS CAUSING THE SYSTEM TO FAIL THE OPERATIONAL TEST AND REPLACED IT PER TASK CARD 26L00025011.