What was found
SIGNIFICANT AIRFRAME VIBRATION FELT THROUGHOUT ENTIRE AIRCRAFT. FLIGHT RETURNED TO DEPARTURE AND LANDED SAFELY WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. AIRCRAFT WAS GROUNDED. MAINTENANCE FOUND EXCESSIVE PLAY ON THE LEFT ELEVATOR, NR 1 HINGE FITTING ARM, THE RIGHT ELEVATOR, NR 2 AND 3 HINGE ARM FITTINGS REPLACED.