As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOTHROTTLES WILL NOT STAY ENGAGED. KICK OFF SHORTLY AFTER ENGAGEMENT. GROUNDED YES. PERFORMED FIM 22 31 TASK 805 CURENT STATUS BITE GOOD BUT A/T INTERACTIVE/SERVO MOTOR TEST FAILS LT THROTTLE WILL NOT DRIVE. ASM 1 AT FAULT. REMOVED/INSTALLED ASM 1 REF. MM 22 31 91. OPS NML REF. SAME A/T CURRENT STATUS/INTERRACTIVE SERVO MOTOR TEST GOOD REF. 22 31 00 A/T SYSTEM TEST.