As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT 11000 FEET, AIRCRAFT ACCELERATING THROUGH 270 KNOTS, AIRCRAFT STARTED VIBRATING. AT 300 KNOTS YOKE STARTED BOUNCING FORWARD AND AFT 3-6 INCHES. NOTICED WINGS VIBRATING AT A HIGH FREQUENCY AS WELL. SLOWED AIRCRAFT DOWN TO 200 KNOTS AND VIBRATION WAS ONLY SLIGHTLY NOTICEABLE. DIVERTED, ALL FLIGHT CONTROLS FUNCTIONED NORMAL. R & R THE ELEVATOR PUSH ROD AND ADJUSTED THE CABLE TENSION