This won't be a technical answer...but on our 2014 ST28BH, there's a switch in the cabinet under the fireplace. Here are the instructions I wrote in my notes during our walk-through:
o In the event of a slide failure, the override switches are located under the stereo system inside.
Step 1: Pull the two white plugs on the bottom of one switch.
Step 2: Evenly push the slide in manually.
Step 3: Put both white plugs back in to lock the slide into place.
Repeat with other slide if necessary.
Do not travel and/or use the slides again until they get serviced!
Hope this helps!