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First take a picture of the logs so they go back in the same position . re move logs to gain access to pilot block thermopile is the lager probe of the two it comes undone by undoing the hex nut below it and removing the two wires on the gas valve its easy but fiddly.
I apologize I do not recognize the brand but since a month has passed without an answer I can tell you we have often had to find a replacement without being able to go through a manufacturer. For a fireplace we would need you to upload pictures of the control valve because it is very common for a fireplace valve to have a thermopile and not a thermocouple. If the valve has a battery pack or a electrical plug then the chances are that you have a thermocouple but if there is not an external power source the flame is probably heating a thermopile in order to generate the power needed for the controls.
If that is the case you would need to physically bring it to a shop to be tested for the proper amount of power needed because thermopiles can have a tremendous range.
First clean out pilot light with can of air , or blow down it with a tude. Then brush electrode clean with a clean paint brush ,chech to see if electrode is in the right postion to light the gas not too far away and the spark is strong , Clean thermopile head if fitted, then check thermocuople /thermopile connections are tight . see if this helps .
Yes, hopefully changing the thermocouple (skinny sensor) or thermopile(fat sensor) would do the trick. Start with these fairly inexpensive repairs first. Unfortunately if the honeywell valve is bad a new one can be expensive. Also it is hard to order parts from Majestic, they just went bankrupt, not to long ago and Martin is taking them over. You might look for your valves model# and check online for other suppliers of that model# or ask for a compatible Direct Vent gas valve that's not as problematic. (eBay and HVAC dealers, etc.) FYI: You said it's been about 5 years, you might decide it's less of a hassle to have new gas fireplace installed. Martin and Empire are probably two of the best, with 5 year parts and labor warrantys. Hope you find some success in your endeavor.