Is there a vacuum element under each front seats in the W123C?
If there is, is removing the seat the only way to access it?

I have a feeling that my driver's side seatback vacuum element is not working correctly. It could be the cause of my vacuum leak (It wouldn't hold the vacuum over more than 8 hours..)

HOWEVER....
today... I opened the car after leaving it for more than 12 hrs... and voila... all the locks opened quickly.. I was like.. "What the..."
It even had enough vacuum to lock everything and open 'em up again. All this before starting the engine.

It's been doin' this for the past two weeks... Maybe the car fixes itself up... The water leak is gone now. I don't think I can explain it...