My dump valve was sticking open so I just bypassed it and dump the vacuum manually using the release button. The problem Im having now is that one of the arresters on my drivers seat doesn't want to disengage when the vacuum is dumped. All the others do though, the second one on my drivers seat and the two passenger sides included. Anybody else ever had this problem? I've never taken the seats apart before and would like to be able to check the arrester without actually having to take the seat out of the car. Is this possible?

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1983 300CDT -- 177K