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I believe the Conquest is a tradename used by Rheem, If so there will be a part number on old board that begins with something like 62-XXXXXXXX or similar.Do you see that number?
May be hard to locate by furnace model. I will se what I can find out.When will you be onsite?
If we can get that part number will be easy to find. Very similar to the RGPS furnace and very possibly same but lets make sure. See links below: