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Panel/door-same thing. No by-pass sounds unusual IMO. I typically blow out my campers but i have added antifreeze too.You may not find any bypass valves. You may need to install yours aftermarket!
quit looking for access doors, and look for access panels!
If you activate the pump, you should be able to pin point its location. Ours is under the sink under the bottom panel. Not sure on the heater by pass. Likely in the same area.
Coachman may be able to help you with the location. They can look up by Vin#.