As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6439 - BOS-JFK - ABORTED TAKEOFF DUE TO LEFT ENGINE WILL ONLY MAKE 91 PERCENT TORQUE. AIRCRAFT RETURNED TO GATE WITH NO FURTHER PROBLEMS. MAINTENANCE INSPECTED AND GROUND RAN AIRCRAFT AND COULD NOT DUPLICATE. OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)