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Here's the final draft on those two air tank drains. I have other issues with the coach not airing up past 30psi. Governor leaks air from the exhaust port. Swapped it out to get the same result. Air dryer bad? 2 years old.

Hmm if your governor is leaking via the exhaust that means you have enough pressure to overcome the spring in the governor. Perhaps there is a block somewhere. What kind of air dryer does your coach have? 
Sure you have all the correct ports being used on the governor, have to ask? Is the governor directly mounted on your air compressor?