What was found
(CAN) DURING CRUISE AT APPROXIMATELY FL330, THE EICAS TRIGGERED AN A/T FAIL ADVISORY, TOGETHER WITH THE A/T DISCONNECT INFORMATION AUDIO ALERT AT, AT, AT . ALSO ON THE HSI (FMS MESSAGE LINE) A YELLOW MESSAGE WAS POSTED `INVALID SPEED USE MANUAL`. WE CONFIRMED THE A/T AURAL INFORMATION, SELECTED MAN SPEED AND REENGAGED THE A/T. THE FMS SPEED REFERENCE ON THE PFD SHOWED THREE - - - (DASHES) (TC# 20190620009)