What was found
EXCESSIVE AIRFRAME VIBRATION OCCURRED WHILE CLIMBING & ACCELERATING OUT OF BLOCK. BECAME MOST NOTICEABLE THROUGH FL190, SPEED 280 KIAS. SEEMED UNAFFECTED BY THRUST CHANGES, MOST AFFECTED BY SPEEDS 280 & ABOVE, NO UNUSUAL FLT CTL INDICATIONS IN CLIMB, CRUISE & DESCENT. GROUNDED - YES. AIR TURNBACK - REMOVED & REPLACED VERTICAL STABILIZER HINGE BEARINGS AND ACCOMPLISHED OPS CHECKS PER A320 AMM 27-21-41-000-001-A, A320 SRM 55-36-42-300-009 AND AMM 27-21-41-400-001. ALL OPS CHECK GOOD.