I think I've answered my own question:
First of all I found the "Dual Motor Synchronous Velocity Slide Controller" P/N 13398-D0 in the lower storage compartment on the drivers side, just below the kitchen slide-out.
From there, I found http://www.lci1.com/assets/content/s...-schwintek.pdf
. This manual doesn't reference the "-D0" model of the 13398, but close enough to determine that I have an "In-wall Slide-out. Page 8 of this manual shows that the motors (2 per slide-out) are integrated into the slide-out column's...and thus would not (at least for me) be accessible/serviceable.
But. this YouTube video
is the answer on how to get the slide back in and provides instructions on how to (1) reset the controller, (2) manually push in or (3) disengage the gears to make manually pushing in easier...but in this last case you must brace the slideout!
I don't believe that there is any manual crank on this type if slide-out