By the Numbers, I have never had to work on these before.
syptoms:
all doors will lock with drivers door but not unlock.
Front Passanger door will lock itself
trunk will not open without a key.

the only other Vacuum problem that I have noticed is no air blowing out of center vents. related?
this is on an 84 300D(cali) with just shy of 151k.
I need trouble shooting help with exact locations of parts.

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project

could be anything. you should buy a 'mity-vac' to trouble shoot your vacuum system though. my doors wouldn't lock or unlock as there was a vac hose that managed to fall off the tube going to the pod that opens closes the fresh/recirc vent. after you get the mity vac then you can start to test different things and eventually you should get it...could be the a trunk leak, could be a fuel door........could be a pod, could be the valve behind the driver's door panel that tells all the other door locks to do........sorry so vague

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alimony