Trunk pull down failure is one of the first signs of pump failure. Reset switch #9 on the trunk and that should buy you some time.
Usually is the driver's doors self-closing mechanism and/or the trunk pull down to fail first as the self-closing vacuum pump starts to fail.
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A. Rosich
CL 500, 1998 
S 500 L, 1998 
E 320 T, 1995  [Sadly sold  ]
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