Master Vaccum Switch/Door locks

[mgcanuck]

I'm trying to diagnose my door lock vacuum problems. New check valve in engine compartment. The lines and actuators all work and hold vacuum (when tested after the master switch in the door). However, the master switch itself seems to be leaking.

Can someone verify proper operation of this valve? It seems that on locking, it holds vacuum, and unlocking it dumps all the vacuum (or the other way around). I can hear a *swish* as the vacuum is released. Is this correct? It seems it only holds vacuum when the pin is absolutely seated in the switch. It might also be the check valve that is in-line on the vacuum line to the switch itself? I have tested that valve and it seems to leak when i plug it with a golf tee, though not when i put my thumb over it...Argggh....