As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS AT FL390 IN CRUISE, AUTO THROTTLE DISCONNECT MESSAGE DISPLAYED ON UPPER EICAS. NOTICED THAT ON THE THRUST LIM PAGE, DISPLAY WAS BLANK. THIS HAPPNED TWICE. THRUST LIM PAGE HAD NO INFO SO A/T DISCONNECTED. MAT SHOWED MAINT MSG 22-29124, 22-29125, 22-29610. ACCOMPLISHED FIM 22-31-00 810-878, FIM 22-31-00-810-939. ACOMPLISHED L & R TMCF A/T SERVO LOOP TEST- NO FAULTS FOUND.