What was found
THE NOSE GEAR DID NOT RETRACT AND WAS ACCOMPANIED BY THE RED GEAR UNSAFE LIGHT REMAINING ILLUMINATED AFTER TAKEOFF FROM MIA. THE GEAR WAS CYCLED, BUT THE HANDLE WOULD NOT COME UP. THE AIRCRAFT WAS DIVERTED TO MCO WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE NOSE STRUT SCHRADER VALVE DEFECTIVE. THE SCHRADER VALVE WAS REMOVED AND REPLACED. THE NOSE GEAR WAS SWUNG SEVERAL TIMES WITH NO DEFECTS NOTED. A VISUAL INSPECTION OF THE GEAR FOUND NO OTHER DEFECTS.