What was found
DURING CLIMBOUT, LOSS OF POWER ON LEFT ENGINE (LOW FUEL LOW PRESS MESSAGE) N2 DROP 15% WITH VIBRATION AND YAW TO LEFT (LT MAIN EJECTOR) MESSAGE, POWER UP, LOSS OF POWER 3X. SMOOTHED OUT (LOW FUEL, LOW PRESS ON LANDING). REMOVED AND REPLACED LEFT ENGINE FUEL PUMP AND FUEL CONTROL, FUEL PUMP SHAFT HAD EXCESS PLAY.