I have the same problem. The Self Propelk isn't working. I took the handle off and found that the control cable is broken. The part is about $12. I need to find out how to put the new one in.
I took it to a vac shop who wants to charge $170! Actually the first estimate was about $100, then maybe $120 and now it's $170. I haven't this shady service from a car repair shop. I'm going to pick it up now, unrepaired.
Lori Frank, September 2005