1991 300SL

There are a number of yellow vacuum lines at the door lock vacuum pump. There is also a larger clear/opaque line. The yellow lines exhibit no leak. The clear/opaque has a leak. I can pull no vacuum on it. What does it lead to?

Secondly, the pump only clicks lightly when I actuate the remote. What feeds the power to the pump? Does it come from a fuse someplace? Some sort of other controller? What is the source of the main power for the vacuum pump? Anybody? Help? I am assuming the various lock switches only actuate a control voltage that actuates a relay in the pump - true?

I am hoping to find the leak in the clear-line circuit, and then find a blown fuse as a result of that leak. Please make my day!
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Thank You!
Fred
2009 ML350
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1997 C280 Sport