As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 8020 - IAD - ABORTED TAKEOFF DUE TO WHEN THRUST SET, IT STARTED RANDOMLY SWITCHING BETWEEN T/O 1 AND ALT T/O 1. MAINTENANCE SWAPPED FADEC 1B AND 2B AND PERFORMED AN ADJUSTMENT AND TEST OF THE THRUST LEVER IAW AMM PROCEDURES FOLLOWED BY AN AIRCRAFT ENGINE RUN. NO DEFECTS NOTED.