As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE MAIN GEAR GREEN LIGHT DID NOT COME ON AS THE GEAR WAS LOWERED ON APPROACH. AS THE CREW DID AN INSPECTION PASS, THE LIGHT CAME ON AND THE AIRCRAFT CARRIED OUT AN UNEVENTFUL LANDING. MAINTENANCE REPLACEDTHE MAIN GEAR DOWNLOCK MICROSWITCH. THE SUBMITTER STATES THIS IS THE THIRD LANDING GEAR DOWNLOCK SWITCH THAT HAS FAILED ON THIS AIRCRAFT IN A ONE MONTH PERIOD. SUBMITTER SUSPECTS FAULT IS RELATED TO EXTREME COLD WEATHER OPERATION.