why did the one motor go 'bad'....? Was there some kind of binding on that side of the slide to put more stress on that motor.Is there a side to side binding or binding from the top to bottom? Your 'good' motor may never go 'out' and the one that just 'went bad' may go 'bad' in a short time again because you never 'fixed' the reason that it went 'bad' to begin with. Replace the 'bad' one and keep it and see how it works outside of the wall, it may be 'weak' but still good. Adjust the slide and make sure that it goes in and out smoothly. my 'main' slide seems to bind all of the time and it has been 'adjusted' 5-6 times and I 'still' need someone to gentle push the slide in and out for it to go smoothly.
2013 Forest River Salem Hemisphere SBT312QBUD
2001 CrewCab F-250 7.3 PowerStroke Diesel
SuperChip, BTS transmission, 6.0 Trans Cooler