As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON ENGINE RUNUP FOR TAKEOFF WITH BOTH ENGINES AT 50% N1, THRUST LEVERS PLACED IN TOGA LEFT ENGINE EXTREMELY SLOW TO RUNUP. ASSYMETRIC THRUST CREATED REJECT ON RUNWAY. MAX AIRSPEED 50 KTS. ACCOMP;ISED TSM TASK 71-00-00-810-807-A AND TSM TASK 73-20-00-810-919-A. REPLACED LT ENG T-12 SENSOR IAW AMM 73-21-40.