Where is snap disc on Enviro E30I gas insert?

[Dampfnudel]

My blower fan won’t start and I want to test the snap disc (temperature sensor). I’ve pulled out the gas insert from the fireplace but I can’t see the snap disc anywhere. I confirmed the blower motor still works. What panel do I need to remove to access the snap disc?

 

[Dampfnudel]

Update: I have the newer Proflame 2 IFC Control Module Board that no longer uses a snap disc. The IFC module controls the blower by time (5 or 6 minutes after the gas is lit, the temperature is warm, so then the blower can turn on if activated on the remote control). So good news I don't need to test or swap out the snap disc, bad news is that I probably need to replace the IFC module so that I can get my fan to work again.