As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AILERON LOCK OUT EICAS MSG DURING TAXI OUT. AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. MAINTENANCE DEFERRED AILERON LOCKOUT EICAS MESSAGE PER MEL 27-11-2 MBCB 1-22-23 MAINTENANCE PROCEDURES C/W PLACARD INSTALLED. AIRCRAFT RETURNED TO SERVICE.