As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTO THROTTLE WILL NOT STAY ENGAGED. ACFT GROUNDED. ACCOMPLISHED A/T BITE REF FIM 22-31-TASK 801. FOUND FAULT MESSAGE 22-31687-ASM1. REMOVED AND INSTALLED NEW NR 1 ASM REF AMM 22-31-91. PERFORMED INSTALLATION TEST, SERVO MOTOR TEST REF AMM 22-31-00. ACCOMPLISHED IAW LWMP SYS TABLE A/T TEST REF AMM 22-31-00/501. A/T OPS TEST AND HGS SENSOR TEST FOR A/T. ALL TESTS PASSED.