As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AILERON LOCKOUT LIGHT AND EICAS MSG ILLUMINATED. AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. MAINTENANCE PERFORMED FIM 27-11 FAULT TREE 804 AND NO DISCREPANCIES NOTED AT THIS TIME PER 27-11-44. DMI 29728 CLEARED. PLACARD REMOVED. OUTBOARD AILERON LOCK OUT MECHANISM OPS CHECK NORMAL PER AMM 27-11-44. AIRCRAFT RETURNED TO SERVICE.