Mod DGAA070 BDTA..,Ser. 031002087 Guys.,dont work on these furnaces normally. Intermintant start up issue.,arrived #3code.,stuck pressure switch.checked the usual,hoses,elec,.Then it started ran few time then got #2code open P/Sw. Decided to check inducer motor pressure..,Where is it! of course its in the 4inch intake pipe, took readings, its a 2 hose P/Sw got 0 on one .04inwc on other. Iguess my question is..,how much will this "watch" motor pull?..,how do you get things apart to replace it (has closed Combustion) thing would not act up again while I was there.,I at least want to replace P/S since I believe i found it "stuck' twice! Any thoughts..,thanks ahead. P/Sw.rating was 0.18pr.