Marco Direct Vent Fireplace Model 794153B - 10 Years Old Lately the pilot light is not engulfing the thermopile like it used to and when I turn on the wall switch to start the fireplace it will not turn on about 40% of the time. I have thoroughly cleaned the entire head assembly of all rust and soot (thermopile, thermocouple, igniter, etc.) to no avail. I am taking an educated guess and am thinking it is because the pilot flame is weak and is not touching the thermopile. I never received an owners manual for this fireplace (came with the house)and cannot find one online. There are several screws on the "gas valve/igniter assembly" for adjustments, but I do not know which one is used to adjust the pilot light. Any help would be appreciated. I can post a picture of the gas valve if that helps to show which valve adjusts the pilot light.