What was found
VIBRATION REPORTED IN CLIMB STARTING AT FL200. VIBRATION COMING FROM COCKPIT FLOOR AND ROW 12 FWD IN PAX CABIN. UPON LEVEL OFF FL300, VIBRATION DID NOT GO AWAY, WITH CABIN CREW REPORTING IT WAS GETTING WORSE. DUMPED FUEL AND RETURN TO IAD. INSPECTED AIRFRAME AND FOUND WORN BEARING AT INBOARD END CAP OF RIGHT PACK RAM AIR INLET DOOR TORQUE TUBE. REPLACED END CAP. AIRCRAFT RETURNED TO REVENUE SERVICE WITHOUT FURTHER VIBRATION REPORT.