I'd start by contacting Spartan to get a diagram of your air brake/suspension system. I have to ask, why are you holding the brake treadle down for long periods of time? Also, have you drained the tanks and made sure your air dryer is working? A bad valve in the back could have been a warning that moisture or dirt in the system is fouling the valves. Can't help you with a Phoenix recommendation, but I'm sure there are folks on here who know who to contact.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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