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I am certainly not a pro, and am not certain about what you need to replace, but from the symptoms you describe, the first thing I would look at would be the rheostat, since you are describing being unable to have slow speed control while still having high speed control. It might just be that the rheostat is dirty and some of the contamination is causing the problem. I don't know the cost of replacement rheostats, but it may end up being less expensive just to replace the whole unit than to replace the rheostat (if that is in fact where the problem lies). Good luck!
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