Jason,
You can get the repair kit with free shipping for your machine (8154) there.
For the mother board, if it is just the power switch then it likely just needs to be resoldered. If you do not know how to do it then send it to me while you are making the bearing repair and I will do it for you and send it back. The motherboard is working fine if it works but if the switch is working sometimes and not others then it is most likely just a loose or broken connection.
Jerrod