As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT AILERON EICAS POSITION INDICATOR DOES NOT INDICATE FULL DEFLECTION DURING BEFORE TAKE-OFF CHECK.AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE. MAINTENANCE DETERMINED THAT THE PROBLEM WAS THE POSITION TRANSMITTER AND THAT THE AILERON HAD FULL MOVEMENT. THE AILERON POSITION SYSTEM WAS PACED ON DEFERRAL IAW MEL 27-08-01 AND THE AIRCRAFT WAS RELEASED FOR FLIGHT.