Got this dishwasher used, it's been sitting a while. The door doesn't latch completely: doesn't pop open but doesn't keep it tight enough to keep it running. We prop it closed but even then we have to push on the door several times during the cycle to restart it. Also, the top arm isn't spinning. There doesn't seem to be any blockage, not sure how much pressure it is getting but it does fill up with water, when I spin it water comes out. Spins freely by hand. Any ideas?