I cleaned out my rear valve block 5 years ago, and replaced some of the o-rings from the local hardware store. It was full of dessicant powder. Still works fine. C1A20-64 = pressure rising slowly. I've had that code several times. Once was due to a bad voss fitting in the front valve block...
Lakeranger's follow up sounds like normal operation. At start up, the front and rear valve blocks get first dibs on air from the compressor to reset the suspension height if needed. Then the reservoir valve opens to top off the reservoir tank, and the gallery pressure rises to a max of 250psi...
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