As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUTOTHROTTLE DOES NOT STAY ENGAGED. ACFT GROUNDED. COULD NOT DUPLICATE, GROUND FUNCTIONAL TEST OK. AUTOTHROTTLE FAULT REVIEW LOGGED NR 2 ASM FAULT NR 22-31688 ON ONLY FLT LEG 16 ONLY. ACCOMP FIM 22-32/819, A/T CURRENT STATUS CK & TORQUE CHECKED NORMAL.