My window goes down freely, but seems to be in a limp mode when going up. The first 4 times I attempt to raise the window, I hear a clicking sound but the window does not go up. On the 5th try, the window goes up a small amount and then stops. As I keep moving the switch, it raises up the same small amount each time, until it gets to the top. Any ideas as to what might be the problem? I am guessing the micro switch, but they are not sold separately.