As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH ONLY APU RUNNING, MAU 2B FAULTED RESULTING IN THE APU SHUTING DOWN. PILOT RESTARTED APU AND FAULT DID NOT RETURN. MX COULD NOT DUPLICATE PROBLEM. FAULT HISTORY DOWNLOADED, CHANGE THE MAU 2 NIC 2 MODULE ASSY WITH PROCESSOR. OPS CHECKED GOOD.