Slide out issues - power gear e-synch slide out

I first thought relay too - has 4 and I replaced all 4 plus the breaker, and it still does the same thing. One motor works but other motor doesn't. Spoke with Lippert and, get this, they want almost $2000 for a replacement kit which includes two new $900 motors. Wondering why I couldn't get a different model controller and wire from the coach harness into it - all kinds of controllers online for less then $200 - just basically an in and out/on and off switch????