As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT, CAB AUTO INOP EICAS MSG CAME ON. RESET CB ON P11 CAB ALT 1 AND CBN ALT 2. PERFORMED BIT ON BOTH CONTROLLERS. TEST FOR AUTO 1 AND 2 SHOWS CONTROLLER FAULT. PERFORMED VERIFY RESET NO FAULTS AND NO STATUS MSG NO FAULT LIGHT FOR ALT 1 AND 2, SYS CHK GOOD.