I've been using this stove and it's time to clean the combustion system. In reading the cleaning instruction I find reference to two items that I have now Idea what they look like or where they are. 1) Probe thermostat 2) Combustor and Probe. These may be one in the same. The instruction say "the probe thermostat should be inspected annually". Then in another paragraph it says "inspect the combustor and probe". The exploded view of the stove shows neither of these items. Can someone help me with this as I took everything apart internally, clean it and put all back together and never found any "probe". Thanks for any help provided.