As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA - FLT 640 - AFTER TAKEOFF, NOSE GEAR UNSAFE UP INDICATOR ILLUMINATED WITH LOUD AIR NOISE. ACCOMPLISHED ABNORMAL PROCEDURE (RED GEAR LIGHT IN FLIGHT, GEAR HANDLE UP) RESULTING IN ALL GEAR DOWN AND GREEN. RETURNED AND LANDED MIA WITHOUT INCIDENT. REPLACED NOSE LANDING GEAR SHRADER VALVE. SYSTEM GROUND CHECK NORMAL OPERATION. (M)