What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS NOT DECLARED DUE TO: DURING APPROACH AUTO THROTTLE MOVEMENT WAS NOT SYMMETRICAL WITH NUMBER 2 THRUST LEVER LEADING NUMBER 1 BY ONE KNOB LENGTH. AT GLIDESLOPE INTERCEPT NUMBER 2 THRUST LEVER ADVANCED TOWARD GO AROUND THRUST WITH NUMBER 1 THROTTLE LAGGING BY APPROXIMATELY 5 KNOB LENGTHS; AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT MIA. REPLACED FLIGHT CONTROL COMPUTER-A. PER MM 22-11-33 AND ACCOMPLISHED DFCS TEST PER MM 23-11-00, OPERTIONAL CHECK NORMAL.