well, spent about an hour locking and unlocking the doors which would cause the buzzing noise to come from the vacuum pump in the trunk of the car....so that's definitely the source, could not find a single point where hissing leakage of air could be detected by my hearing.
what vacuum lines I did find that were related to the locks seemed in fine shape.
am thinking it's the actual actuator mechanism for the vacuum lock on the passengers side door that is not functioning correctly. I guess I'll put it on the list of things to be fixed when I take it in for some other items that I am putting off till the spring.
thanks all for your feedback, will just have to lock the doors from the passenger side for the time being.
Network Integration Engineer
MCSE, CLP, CCNA