First I had the left side opening but not closing, no prolbem with the right side. So I replaced the left motor with a used one. Now the the left side works fine but the right side opens, closes, then opens and stays open. They both close ok. It seems like the right side is getting open before the left one so the right side motor makes another revolution then stops the second time around when it sees that the left one is open. I could be wrong about this I just guessing about this. I'm thinking about disconnecting the left one to see if the right one works ok by its self. What do you think?