What was found
WHEN RETRACTING THE LANDING GEAR ALL THREE GREEN LIGHTS EXTINGUISHED, BUT THE RED GEAR UNSAFE LIGHT REMAINED ILLUMINATED FOR APPROXIMATELY 3 MINUTES DURING WHICH THE LANDING GEAR REPEATEDLY MADE A BANGING NOISE AS IF IT IS MOMENTARILY EXTENDING AND RETRACTING. DURING RUNNING THE ABNORMAL CHECKLIST THE NOISE STOPPED AND THE RED LIGHT FINALLY EXTINGUISHED ALTHOUGH SOME WIND NOISE REMAINED FOR APPROXIMATELY 30 SECONDS. THE CHECKLIST REQUIRED PILOTS TO SELECT GEAR DOWN, GET THREE GREEN LIGHTS AND LAND AS SOON AS PRACTICAL. LANDING AT TPA WAS COORDINATED BETWEEN FLIGHT CONTROL AND MAINTENANCE CONTROL. AIRCRAFT WAS TAKEN TO ORLANDO CITATION SERVICE CENTER WHERE NOSE GEAR STRUT WAS REPACKED AND ORIFICE BEARING WAS REPLACED.