What was found
CLIMBING THROUGH FL180 FELT VIBRATION IN FLIGHT CONTROLS, RUDDERS AND PILOTS SEAT. AFT F/A'S REPORTED NOTICEABLE VIBRATION IN AFT PART OF AIRCRAFT. VIBRATION ALSO FELT IN LEVEL FLIGHT AND DESCENT. FLIGHT CONTROL STATUS PAGE NORMAL (AP WAS ON AND OFF) ACCOMP TSM 05-50-00-810-801. FOUND ELEVATOR BLUE SERVO LT CONTROL BEYOND LIMITS. REMOVED AND REPLACED SERVO IAW 27-34-00-220-052. ALSO FOUND ELEVATOR BLUE SERVO RT CONTROL WITH JAM NUT LOOSE ON ROD END. ADJUSTED & RETIGHTENED IAW TASK AMM 27-34-51. OK FOR SERVICE. VIBRATION REPORTING SHEET FOR OUTBOUND CREW HAD NO FURTHER REPORT.