Hopefully this is of some help!
I had trouble with my Pinnacle's Schwintek entertainment center slide. To get to the motor and determine what the problem was I removed all of the outer slide flange screws. If the slide is already in (or else you need to push it in enough) you need to remove the 4 (in my case) inside flange screws. With a partner on the outside and you inside have a tug of war to separate the inner and outer slide parts. This will allow you to access the motor and its locking screw from outside on top of the slide. You should then be able to remove the screw, unplug the motor, and work on the issue.
I found that my slide problem resulted from the blue lead wire on the slide motor rubbing off its insulation causing it to short out which created intermittent movement. This was obviously an initial installation error!!
Good luck with getting this solved. I had to work on mine while on the road to Alaska in May!!
'06 2500 Silverado 4X4, Duramax LBZ Diesel, Firestone air bags
'08 Tracker Pro Guide V-16 Boat
'12 Pinnacle 31RLTS