What was found
ACCELERATING THROUGH 290KIAS AND CLIMBING AT 3500FPM. A/C BEGAN STEADY OSCILLATIONS UP/ DOWN MOVEMENT. MAGNITUDE INCREASED WITH HIGHER SPEED. SLOWED A/C TO 280 KIAS AND REDUCED PITCH ATTITUDE TO ESTABLISH 100FPM CLIMB. OSCILATIONS CEASED DECELERATING THROUGH 290KIAS. AT 280KTS AND LEVEL FLIGHT NO UP/DOWN MOVEMENT FELT. AIRPLANE FLEW NORMALLY BELOW THOSE SPEEDS FOR REMAINDER OF FLIGHT BOTH MANUALLY AND WITH THE A/P ENGAGED. NO OTHER ABNORMALITIES NOTED. R/R RIGHT SIDE CONTROL CRANK BEARING AND SLEEVE PER AMM 27-31-74.