Central locking problem 190 E

I have a 1988 190 E 2.6 the remote central locking will now not unlock the doors, the sound is there and the buttons move slightly but the do not pop up, if I use the key in either doors it works fine.
Any Ideas.
John
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Your car appears to have a vacuum leak. Suggest you first check the vacuum bellows in the driver's door, but you should know the leak could be anywhere, including the gas flap and trunk lock.
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I did think of that but if that is the case why would the central locking work ok with the key in either door locks.
John

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So go to the part that doesn't work.
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None of it works, I stripped the drivers door down today, disconnected the vacuum pipe, using the key in the passenger lock when opened I get air pushed out, when locked I get A vacuum, do the same with the remote opened I get nothing or very little either way, when closed I get a Vacuum

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