When you attempted the stop reset, the side/motor in question did not move, but the opposite side did start to move out (assume slide is in), correct?
Doing the double button push (on the back of the button panel) should have at least moved the "good" motor outward (while pushing the OUT button). Did that happen on the stop reset attempt?
Holding down those 2 internal buttons and pressing the OUT button overrides the stop setting and should move the motors outward. The slide needs to move outward before resetting the IN stops.
I'd retry the button reset procedure again, as it can be easily done wrong / not taken on the first try.
Are you still getting the blinking red & green lights on the button panel? The same pattern as before the reset attempt?
The motor controllers in the Inverter/Charger/relay/wiring bay also have blinking lights that should have the same problem identified as the button panel. That will also show you which controller is doing which slide. Can you confirm the motor control blinking lights are the same pattern on the Controller?
As
@malmz points out, also check on the motor wiring at the motor end in the wall, get eyes on the motor by flipping back the inner gasket to visually inspect it and the wiring and the plug connection.
If all that looks good, then before replacing the motor (which entails a lot of remove of stuff in tight spaces), you may want to try a motor controller swap (with the good slide in) as it is easier to do.
Unplugging the "working" motor controller from power and swapping it with the non working slide controller is another possible diagnostics step, but if one motor was responding and the other not, then I would think the controller is not the issue (but maybe it is). When my motor controller failed, neither motor would move. Doing a swap got my slides to come in so I could travel and finish a trip, but each swap required a stop reset procedure on each slide as I moved the one working controller from one slide to the other and back again.
If you opt to they this, make sure the good / working slide is in, as the "good" controller will need a stop reset when swapped too (thus losing the prior slide stop settings) and when swapped back you will need to do the reset again (rinse repeat). Be sure to mark both controllers (to their slide) and their wire/plugs (to their slide) to know which goes to which before any unplugging / swapping, so it can be put back to original after this diagnostic step. The plugs themselves as I recall are unique to the controller function so can be identified as to which controller socket they go into. You may need to unscrew the control from the bin wall to make the swap to reach the wiring harness for each.
Depending on the controller and wall switch you have in your model, this may be of help in general understanding the controller swap steps and to locate / identify the controllers:
Can you share a photo of the button panel and controller(s) you have? These may have changed over model years.
What model year 32KD?
