As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE PILOT REPORTED, THAT THE LEFT ENGINE DID NOT ACCELERATE TO COMMAND SECTOR LIMITS. EPR WILL SOMETIMES STAY PUT WHILE N1 ACCELERATES TO 2 - 3%. N1 VIBRATION HIGH 1.6, 1.4, 1.8. THE AIRCRAFT WAS GROUNDED. MAINTENANCE PERFORMED AN EPR P1 LEAK CHECK WITH NO FAULTS FOUND. INSPECTED EPR P1 & PF LINES WITH NO FAULTS FOUND. REMOVED AND REPLACED THE THRUST MANAGEMENT COMPUTER AND PERFORMED ALL REQUIRED TESTS, RAN ENGINES. NO FAULTS NOTED.