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thank you supermen is there a schematic that would show me what valve looks like also pressure switch any idea cost on upgrading dryer?

coffey can you explain where the pcu is I'm a fast learner[thumbzup]

​ctis issue

I have a 1078 and when I'm up and going the Ctis box starts to click and lights start blinking if I push one of the buttons it stops making noise for awhile but starts shortly after when I go to shut down the air starts to come out by the frame rail kinda by the fuel tank making a squealing...