What was found
CLE FLIGHT 4233 THE CREW REPORTED A LOUD NOISE AND VIBRATION UNDER THE FLIGHT DECK ON CLIMB OUT. RECYCLED THE LANDING GEAR AND RECEIVED A LANDING GEAR LEVER DISAGREE MESSAGE. THE GEAR WAS RECYCLED AGAIN, RECEIVED 3 GREEN DOWN AND LOCK INDICATIONS. THE AIRCRAFT RETURNED AND LANDED IN CLEVELAND WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE LANDING GEAR ELECTRONIC UNIT AND OPERATIONAL CHECKS WERE GOOD. THE AIRCRAFT WAS RELEASED FOR SERVICE.