KimnKim,
The parts arrived and appear to have solved the problem. The coach is airing up and leveling within 1/8".
Each part worked out to $43 with shipping. Ordering more would probably bring down the per unit cost due to shipping. Had I known they were this price, I would have asked that all 12 be replaced.
While it is difficult to tell, I believe they were acquired from a company in Indiana called SMC. I did a google search on SMC solenoids and came up with this link:
http://www.smcusa.com/
The part number was VX 2110-02N-6G1-B.
My guy ordered thru Newell and I was pleasantly surprised when he did not add a markup.
Hope that helps.
Larry P.
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