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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?

[BusNit]

Governor is remote mounted and matched up to new with same ports used. I verified no blockage. Coach uses a Bendix AD-9. (I did reinstall my old yet working governor to have the same air loss.)

For giggles and the time of labor, I bought a replacement AD-9 and some new compression fittings. That area was cobbled together by the craptastic shop that overcharged me $7700 a couple years ago. Sure it worked but they used push on fittings on the large delivery lines and whatever was threaded on, was not very tight. I will rebuild and keep the AD-9 I removed as a spare.