Well I lied, I couldn't take the rig back to storage until I found the problem. I had to vacuum the insides to get rid of the sand so when I extended the room I looked underneath. I saw a damp spot and crawled under to get a better look. There is a tee that is connected to the cap end of the room cylinders and to the manifold. It is both the extend and retract line. I cleaned the fittings on all three hoses and the Tee itself and cycled the room a couple of times. Crawled back under and saw a drip forming. Cleaned off the drip and cycled again, checked and another drip forming at the same place.
We've got a good mobile tech that does a lot of work at the storage yard and I'll get a price from him. It's a two hour job and the hose should be $125 to $150. If it's more thaan $350, I'll bring it home and do it myself but it is worth $350 not to have to do it.
Here is a diagram;