As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE VISIT: REF. TII 70566844- WHILE RUNNING A WBU SCR- WELS CONTROL UNITS CLASS NO. 7 AND NO 31 ARE NOT REPORTING. (NETWORK IS NOT FULLY FORMED). MAINTENANCE MSGS 33-12131 AND 33-12107 DISPLAYED ON EXISTING FAULTS PAGE. REMOVED AND REPLACED BATTERY NO. 31. SEE AALA202005059006 FOR ADDITIONAL PARTS.