[mgreen621]

I have 2 questions with one of them being an issue. First, I was trying to find out how old my dishwasher is. It was in the house when we bought it 5 years ago. It is a Kenmore model number 36315161790. Second, I am having an issue with it and I am looking for some help. We noticed last week that our dishes were coming out dirty. After looking at a few things, we found that the spray arm isn't spinning and the center tower that sprays water isn't coming all of the way up like it should (I cheated the door and watched it). The holes in the spray arm are clear. I think the water pressure lifts the tower, but I am not sure of the spray arm spinning. I think it does. I am trying to decide if it is worth trying to fix or if it is worth it to just buy a new machine.
Any input would be appreciated.
Thanks,
Mark