What was found
MIA - FLT 841 - DURING TAKEOFF, PITCH TRIM 1 AND 2 DISENGAGED AND COULDN'T BE REENGAGED, YAW DAMPER NR 2 WAS INOPERATIVE AND APU AUTO SHUTDOWN AT FL220 COULDN'T BE RESTART. THE AIRCRAFT RETURNED TO MIA STATION, AND THE AIRCRAFT REMAINS ON GROUND FOR MAINTENANCE. (M)