Hello New Friends! I have a Adv II-T (1991) with the original analog control board (lucky me, it still works like new!). I'm hoping someone can define for me the 3 trim adjust pots (behind silver caps) on the lower right corner of the control board. I believe them to be conv, comb, and fuel feed trim adjusts, but which one is which? They are not labeled on the board or explained in my op manual. What I'm up to is I'd like to dial the fuel feed down a bit. With a new Ultra Grate, and on these not-so-cold-yet fall evenings, even the #1 heat setting is a little too warm for us. I'd like to back it down to just "keep-alive." (Am I going about it the right way?) Thanks much!