As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 7822 - LAX - DURING PREFLIGHT CHECK CREW REPORTED NOT GETTING AILERON 2 INOP MSG ON EICAS WHILE AIRCRAFT WAS POWER UP WITH HYD SYSTEM OFF. MX PERSONNEL REMOVED AND REPLACED NR 2 AILERON HYD MANIFOLD OPERATIONALLY CHECKED SATISFACTORY. AIRCRAFT WAS RELEASED TO RETURN FOR SERVICE.