I have a slow leak in the locking system of the '80 300SD/ W116:
the locks work after running a while, but the vacuum leaks down after about 45 min. when the car is off.
Can anyone tell me where (or if there are any) the Y connectors are like the 123s in the floorboard. On the 116 the lines go into metal channels under the seats; do I have to remove seats? (Might as well remove each door panel and check each actuator.) It's easy on the 123. Any help? (I have searched)
Kerry, any work in this area?
thanks,
Howell

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'85 300TD W123
'83 300D W123, Daughter's
'80 300SD W116