I think you need to check to make sure the hydro linkages are moving properly. Easiest way to check it out is to cut some sort of hole in the tunnel cover so you can see down in there. If you don't have anything like a sawz-all, go get a round, metal hole saw at your local tool place. If you want to save a few bucks, hunt around everywhere you can online to find the cheapest one. You'll probably have the tool in-hand in 5-7 business days.
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