As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF FROM TPA WITH THE GEAR HANDLE IN THE GEAR UP POSITION, BOTH THE RED AND GREEN NOSE GEAR LIGHTS REMAINED ILLUMINATED. THE GEAR HANDLE WAS PLACED IN THE GEAR DOWN POSITION AND THE AIRCRAFT RETURNED TO TPA WITHOUT INCIDENT. TROUBLESHOOTING OF THE NOSE GEAR INDICATING SYSTEM REVEALED A FAULTY DOWNLOCK SWITCH. THE SWITCH WAS REPLACED, A NOSE GEAR SWING WAS ACCOMPLISHED. THE SYSTEM CHECKED NORMAL IAW 727 MM 32-61-01 AND THE AIRCRAFT WAS RELEASED FOR FLIGHT.