What was found
FLT 368, PUJ-JFK, DIVERTED TO SJU. EMERGENCY DECLARED. CLIMBING THROUGH 310 AT MACH .76 VERY STRONG VIBRATIONS WERE FELT THROUGHOUT THE AIRCRAFT. SLOWED DOWN TO MACH .72 AND VIBRATION DISAPPEARED ; ACCOMPLISHED TSM 05-50-00-810-801 (VIBES). R & R RT B ELEV SERVO (34CE4), R & R EYE END ASSY, R & R SERVO VALVE IAW AMM 27-34-51. OPS CHECK PERFORMED. OPS CHECK PASSED. NO LEAKS NOTED.