Lots of them all differnt colors on the top fo the unit...

Take a phillips screwdriver and remove teh single screw in the backside of the unti that holds the vacuum "block" in the servo. You don't pull the top off or anything just remove the one screw adn the whole block slips out the back of the unit.

Once you get the block loose you can look at how the other lines are inserted and try to get the loose one back in.

The wire looms that connect there via the flat plugs are removed by lifting on the back of them (they are keyed into the servo) and then pulling them free to the rear...

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique