As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REJECTED TAKEOFF DUE TO ASSYMETRICAL THRUST ON TAKEOFF ROLL. THE NR 4 ENGINE SLOW TO ACCELERATE, DID NOT REACH MAX POWER. THE CREW RETURNED TO BLOCKS WITHOUT FURTHER INCIDENT. MX PREFORMED ACCELERATION CHECK, OPS CHECKED GOOD IAW ERH 72.01.1. PREFORMED REJECTED TAKEOFF INSPECTION, NO DEFECTS NOTED IAW MM 13.01.18. ACFT RETURNED TO SERVICE.