As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT ENGINE UNABLE TO ACHIEVE MAX CLIMB THRUST AT FL 390 MAX AVAILABLE EPR=1.67. SHOULD HAVE BEEN 1.76. ENGINE PRODUCED MAX CLIMB AT FL350. REMOVED AND REPLACED NR 1 ENGINE FFG PER MM 73-21-01-4, TAKEOFF EPR REACHED. PERFORMED NR 1 ENGINE THRUST POWER TEST NR 9 AND NR 10. ENGINE PARAMATERS IN LIMITS PER MM 71-00-00-5. (M)