As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: RIGHT HAND AFT SLIDE REPLACEMENT FAILED EMERGENCY LIGHTING SYSTEM TEST PER TASK CARD 26L00025010 STEP 11. MAINTENANCE REPLACED BATTERY FOR EMERGENCY POWER SUPPLY 10WL AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 33-51-00.