As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN ENGAGING TOGA FOR TAKEOFF #1 THROTTLE DID NOT ADVANCE. GROUNDED - YES. ACCOMPLISHED T/S FOR ASM #1 RATE MONITOR FAULT (FAULT CODE 22-31687) PER FIM 22-32 TASK 819 - INITIAL EVALUATION DID NOT CONFIRM FAULT. PERFORMED AUTOTHROTTLE OPERATIONAL TEST PER MM 22-31-00-710-801 - ALL TESTS PASS.