As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DOOR 3R AFT NR 6 WCU BATTERY FAIL, REF NON-ROUTINE NR 9416707. REINSTALLED CLASS 6 WELS CONTROL UNIT BATTERY AND RESET THE ECB THEN CARRIED OUT INSTALLATION TEST FOUND NORMAL. THE FAULT MESSAGE FOUND CLEARED, REF AMM 33-51-07-02B-520A-A & AMM 33-51-07-02B-720A-A REV 140.