You do not have to remove water heater plug. There is a drain line for it.
The hot water heater bypass is three valves you have to change. They are under the kitchen sink.
Step 5 is not necessary
Step 7: No such valve on 29m
You never want the anti freeze in fresh water tank.
I never trust using air.
So under rear most dinette seat, close the valve from the fresh water tank. Connect short length of hose to pump with other end inserted in anti freeze. Turn on pump. Open each facet until water turns pink. Do not forget outside shower and kitchen.
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