As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN THE LANDING GEAR SELECTED TO THE DOWN POSITION AND FLAPS SELECTED 15, RECEIVED A WARNING HORN AND ALL THREE GREEN AND ALL THREE RED LIGHTS. CYCLING THE GEAR HANDLE AND ACHIEVED ALL THREE GREEN ONLY, LANDED. THE AIRCRAFT WAS GROUNDED. ACCOMPLISHED FIM 32-30-00, NO FAULTS NOTED. OK FOR SERVICE.