As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALMOST TO TOP OF CLIMB (18 MIN INTO FLIGHT) BOTH PILOTS HEARD AN ENGINE SURGE NR 1 N1 99% NR 2 N1 96%. NR 1 N1 CAME RIGHT DOWN TO 96%. ON APPROACH HAD A ONE THROTTLE KNOB WIDTH TO MATCH POWER (31 ENGINE THROTTLE BACK TO MATCH) SURGE WAS VERY NOTICABLE IN PAX CABIN. NO ANNUINCIATORS ILLUMINATED. ACCOMPLISHED TEST NR 8 ACCEL/DECEL CHECK. TEST OK NO DEFECTS NOTED. ACCOMPLISHED TEST 5 POWER ASSURANCE CK. TEST OK NO DEFECT NOTED. THROTTLE STAGGER OF LESS THAN 1 KNOB OBSERVED WITHIN LIMITS.