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Most likely a vacuum leak in the door lock and unlock system. Could have just as easily been in the HVAC systems, but in this case it is your doors including trunk and fuel door. Get a mityvac or similar tool and do some searches on this site to get a handle on vacuum issues and diagnosis.
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1961 190Db retired
1968 220D/8 325,000
1983 300D 164,150
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