What was found
(EMERGENCY DECLARED) RHYTHMIC VIBRATION FELT THROUGHOUT AIRFRAME DURING CLIMB WITHOUT CONFIGURATION CHANGES. F/CTL PAGE DISPLAYED ALL SURFACES STOWED. LAND LIGHTS RETRACTED. AUTO PILOT WAS ON. FLIGHT ATTENDANTS REPORTED STRANGER VIBRATION ON THE AFT SECTION. VIBRATION DISSIPATED AT CRUISE BUT RETURNED SEVERAL TIMES. PERFORMED TSM'S 27-20-00-810-808, 27-20-00-810-802, 27-30-00-810-850 AND 27-30-00-810-849, FOUND YELLOW SYSTEM TRAILING EDGE PLAY CHECK BEYOND LIMITS AT 18.74 MM."