What was found
ON DEPARTURE, AUTOTHROTTLE FAILED, WILL NOT REARM. ACFT GROUNDED. REPLACED THE CO-PILOT`S AUTOTHROTTLE DISENGAGE SWITCH IAW AMM 22-31-51-400-801. REPLACED THE PILOT`S AUTOTHROTTLE DISENGAGE SWITCH, OPS NORMAL IAW AMM 22-31-51-400-801. ACCOMPLISHED AN AUTOTHROTTLE SYSTEM TEST, OPS NORMAL IAW AMM 22-31-00-710-802. ACCOMPLISHED DFCS/AT LRU REPLACEMENT TEST, GRP BITE 35, ALL TEST PASSED. ACCOMPLISHED LAND VERIFY TEST, GRP 49, ALL TEST PASSED IAW AMM 22-11-00/201.