FW28z and Fhenn . . .it appears you we both correct! I found a hard-to-find Lippert web page that shows a slide similar to mine. It was in the customer service section under, "above floor sofa slide." It looks like this...
The part I still don't understand is how the manual operation works. Most slides that I've read about say to disconnect the motor and crank something or push the slide in manually. This manual says this...
MANUAL OPERATION
The Lippert Above Floor Slideout System Motor is equipped with a Manual Override system that allows you to extend or retract a room if the rooms do not move when switch is pushed.
With a second person assisting, one person must push and hold the MANUAL
OVERRIDE switch in the unit, located on the control panel, while
the other person, using a 5/8” wrench or socket/ratchet combination, rotates the
hex head MANUAL OVERRIDE (Figs. 8 & 9) to manually move the slideout.
So, it would appear that I don't disconnect anything, just crank that little nut and it will retract? Does that nut rotate when the slide goes in and out normally?