As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH INTO MSP UPON GEAR EXTENSION, GEAR UNSAFE LIGHT REMAINED ILLUMINATED ALONG WITH THREE GREEN LIGHTS. CYCLED GEAR AND INDICATIONS WERE NORMAL FOR APPROXIMATELY THREE MINUTES, THEN RED LIGHT ILLUMINATED AGAIN. FLIGHT CONTINUED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED LEFT DOWNLOCK GEAR SWITCH AND SHORTED CANNON PLUG. GEAR OPERATIONAL CHECK OK.