Does anyone know how to fix the cables/motor or where to get the parts to do so?

At first, one side stopped working, and I didn't think much of it. Now the right side is no longer working, so I took out the bench to take a look.

Everything looked like it was in working order, but when I flipped the switch, neither side moved even though you could hear the motor turning over and the cables grumbling.

I adjusted the cables and was able to get the seat frame to move, however soon after reinstalling the bench, it ceased to function.

Any information would be greatly appreciated!