As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WIRELESS EMERGENCY LIGHTING SYSTEM CONTROL UNIT BATTERY - REMOVAL PREPARE FOR THE REMOVAL - WELS CONTROL UNIT BATTERY REQUIRES REPLACEMENT REMOVED AND INSTALLED NEW BATTERY AT LOCATION R11 ABOVE DOOR 2R REF AMM 33-51-07-02B-720A-A, OPS CHECK GOOD. COMPLIED WITH JOB CARD 78 3350-9-9001 FOR INSTALLATION TEST OF BATTERY.