As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED. AIRPLANE HEALTH MONITORING ALERT RECEIVED FOR L1 DOOR PRIME WIRELESS EMERGENCY LIGHTS SYSTEM CONTROL UNIT BATTERY POWER FAILURE. **SUPPLEMENTAL - 06/23/17 - REMOVED AND REPLACED WELS CONTROL UNIT BATTERY IAW AMM 33-51-07. OPERATIONAL CHECK GOOD. (CLOSED)