As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 6407 - IAD-LGA - ABORTED THE TAKEOFF DUE TO THE LEFT ENGINE NOT MAKING TAKEOFF TORQUE. AIRCRAFT RETURNED TO GATE WITH NO FURTHER INCIDENTS. MAINTENANCE ADJUSTED THE TORQUE SIGNAL CONDITIONER. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)