As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON TAKEOFF ROLL, AFTER N1 SELECTED ON MCP, ENGINE ACCELERATE NORMALLY TO 50 PERCENT AT 50 PERCENT ENGINE DID NOT ACCELERATE ANY FURTHER. ALL PARAMATERS NORMAL FOR BOTH ENGINES. AN AIRFRAME VIBRATION COULD BE FELT AT 25 - 50 PERCENT ON LT ENGINE. TAKE OFF CANCELLED. ENGINE REPLACED.