What was found
PER CREW - VIBRATION NOTICED ON TAKEOFF AND CLIMB, PASSENGERS REPORTED THE NOISE AND FIRST OFFICER FELT THE VIBRATION IN RUDDER PEDALS. NOISE DID ABATE ONCE ACFT SPEED AND ALTITUDE INCREASED. NO EICAS MESSAGES OR SYSTEM FAULTS NOTED AND NO HISTORY OF VIBRATION. AS PER CREW F/A REPORTED FLOOR VIBRATIONS IN AREA BETWEEN B-C AND ECO. VISUAL CHECKED RUDDER AREA. NO ABNORMALITIES NOTED. CHECKED PACK AREA. NO ABNORMALS NOTED. ALL SYS CHECKS NORMAL. PLEASE REPORT NEXT LEG. OK FOR SERVICE.