Where can I find a Goodman gmp 100 3 manual. Just moved into a new house with an older furnace and got hit with a $600 bill to replace a gas regulator, only to find that it is a$100 part(at best) and 45 min. process. I was told that the inductor fans are a big problem on these units and when that fails it'll be another $500, the ignitor is$150 for replacement and that's if they don't require another service call(fix it RIGHT now while I'm here). I found these parts for $120 and$39, respectively, and for simply fixes, as these, I'd rather do them myself, but need the part numbers on the parts involved. Any help would be greatly appreciated.