I also had the same problem - mine needed to be completely cleaned as the motor would not turn on. I took it in for repair and had them show me how it opens. It is not easy to explain and I would not recommend doing this yourself, because when he did it, wires and things started coming unattached -- and without knowing how to put it all back together, I would feel uncomfortable doing it myself. I think it was worth the $99 to have them get it working again.
The canister opens like a clam shell. First open the area where the bags are. Then pull off the rubber siding (let it dangle at the back end). Take a flathead screwdriver, insert it in the the small opening where you just removed the rubber siding from, twist the screwdriver 1/4 turn. If this is the first time the canister has been opened, there is a small plastic part that may break when you turn the screwdriver -- the man said this is common. Now you should be able to pull the rest of the siding off. You may want to use a needlenose pliers. It will be snug. When you pull it off, the dangling rubber siding will come off with it. Once both sidings have been removed from each side of the canister, then pull it open by pulling up on the wheel. That's all I can tell you - I didn't watch him clean the motor and I didn't watch how it goes back together. Wish you luck. Mine's been fixed - he just called today and said it was ready!
jb
August 2005