2013 Prostar blinking dump switch

have a 2013 Prostar with the Maxforce13 (heard all the horror stories, but so far its been a fine engine for me), anyway my problem is when I shut the truck off my airbags lose pressure and very quickly too. It actually seems worse when I turn the key to the on position without starting the engine. So I know my leveling valve was leaking, and I replaced it so now I do not hear any air escaping. However, when I shut the truck off inside of 5 minutes I'm down to 60 lbs of pressure on my gauges, but I cannot hear any air leaks anywhere.
On my dump switch I'm thinking the solenoid is bad, if I dump the air the bags go down and the light goes solid, but when I try to air them back up it just flashes. I have to flip the switch back and forth a number of times until I hear a click which I believe is the solenoid finally engaging then the bags air back up. however, the light on the switch continues to flash and I feel like my airbags are a bit under pressure. I have the replacement solenoid for this but I have no clue where to find the old solenoid pack.
Also, one other question that I'm not sure applies to this. So when I turn the key to the on position without starting the engine my waste gate dump valve starts dumping air. Is this tied into my air pressure, I thought it was over pressure being dumped from the turbo? Could this be the cause of my bleeding air pressure?
When the truck is running I maintain pressure just fine, and as long as the key is off I do not hear anything. Turn the key on and I hear the dump valve bleeding, but again not sure if its connected to my squishy airbags or not or if its a result of a failing solenoid. hope someone can help me, if not thanks for reading my long winded problem anyway.

 

thanks for the tip, I've used soapy water in a spray bottle before and it does work,but not having any luck this time. I'll look for the solenoid pack tomorrow.

 

ok, so the waste gate is a separate issue. That's good to know. I know where it is leaking from, going to just have it replaced. Hopefully then replacing the solenoid will fix the air problem.

 

Yes I did, they are all good. Well they are now, I have to replace one a few weeks ago but I could hear that one. Now there are no leaks on my airbags and I can't hear one anywhere else. getting to the point i'm going to have to take it to a shop to track down the problem. Hate to do that but I can't find the cause. If replacing the solenoid doesn't resolve it I'll take it to a shop then.