Cruise control fails to cancel

[75C10]

I appreciate your help and thank you. Today my cruise worked fine. Go figure. I am planning a big trek to Sacramento in Sept to the C10 club inaugral Intervention. Its 2200 km each way and cruise has to work. I researched the local auto parts stores and searched the internet and I cannot find a rebuilt unit. There just not available in Canada and perhaps scarce in the US. I may call O'Reillys (or somebody) and maybe I can pick up a unit in Spokane on my way through. For the moment mine works and disengages okay. Perhaps the dirt that was contained within it has been sucked out by vacuum and it may operate for awhile.