Have a new Harman Accentra 52i with the touch control. Has anyone figured out how to get into the "dealer menu"? The installers never did a draft check and therefore never did the low draft voltage adjustment for the combustion fan. I ordered a magnehelic gauge and will be checking the draft as soon as it comes in. If I need to adjust the combustion fan low setting, I'll need to get into the "dealer menu". What's the trick?