The Schwintek [bedroom] slide doesn't have cables, well for that matter the other [hydraulic] slides don't either???
Benelli, many of us have lubricated our Schwintek slides with CRC Teflon lubricant
which is used and recommended by the factory. You spray the lubricant in all four tracts on the slide, then run the slide in and out a few times.
These Schwintek systems are temperamental, the lubricant works very well in keeping them working properly. I lube mine about every sis months. The other important factor in operation them is holding the button in for ~3 seconds after they retrace, this synchronizes the motors.