As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT WAS NOT GROUNDED. *AHM ALERT* CLASS 30 - REMOTE WELS CONTROL UNIT CONFIGURATION DOES NOT AGREE WITH OTHER WIRELESS EMERG LIGHTING SYS CONTROL UNITS. REMOVED AND REPLACED CLASS 30 WELS CONTROL UNIT (AALA201711109016) AND BATTERY PER AMM 33-51-07. OPERATIONAL CHECK GOOD.