As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE LEFT COMMAND EPR SECTOR INDICATING HIGHER EPR (1.68) THAN ACTUAL EPR DISPLAYED (1.61). 3/4 OF A THROTTLE SPLIT. EVENT RECORD BUTTON PRESSED. FL390. DECENDED TO LOWER CRUISE ALT, FL290. ENG INDICATIONS NORMAL. NO THROTTLE SPLITPER FIM 73-21-00-815-823 FIG 117 PER BLOCK 32 OF FIM, THRUST LEVERS WITHIN LIMITS FOR FL390