As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) TAKEOFF WAS REJECTED DUE TO NR 1 ENGINE ONLY PRODUCING 89 PERCENT TORQUE AT THE FIREWALL. THE AIRCRAFT RETURNED TO GATE WHERE MAINTENANCE INSPECTION REVEALED A BOLT INSTALLED BACKWARDS ON THE PROPELLER CONTROL UNIT, WHICH HAD BEEN REPLACED THE NIGHT BEFORE. THE BOLT WAS INSTALLED CORRECTLY AND THE AIRCRAFT GROUND CHECKED SERVICEABLE.