Repaired slide problem myself
Initial steps I took:
1. Changed hyd fluid which appears to have needed it.
2. Lubed everything with silicone.
3. Downloaded the manual.
The manual saved me.
Turns out one of the 2 hyd cylinders had its rod end locknut come off and so only 1 of 2 cylinders was actually doing the work, hence the hesitation and appearance of sticking.
Using the manual I reattached it and also adjusted the nuts for correct seal tightness both when open and when closed.
Anyway, tks all for info.
John and Caren, Virginia, 2007 39' Gulf Stream Sun Voyager on W24 chassis.