Fast leakdown of the locking system will be either the check valve,
the lines in the engine compartment going to the interior or the vac
tank under the fender.
Of course, this could just be incidental, and a failure elsewhere,
too. My door locks in the 280 SE finally croaked last time I drove
it, after 37 years....
A MitiVac is sure handy for this sort of thing!
Peter
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