The car in questions is a 1995 E320 sedan with 194k miles. In the past year my check engine light has come on due to deteriorating vacuum hoses. The light is on again and I'm suspecting the same issues is up because the car is running well. Can anyone provide a schematic or list of lines and locations that could be replaced? I'm game for replacing all of them at this point. Any help is appreciated. Thank you!

You probably understand that is is not likely that the plastic vacuum lines are leaking, but that the rubber connectors have rotted and are the problem. Replace them.

Just look around under the hood, count them and the different kinds (i.e. straight union, T, 3 way [that's what she said], or 4 way, and replace away!

but if you are going to touch the hard plastic lines, they will disintegrate in your hand.

Go to Napa, bring your lines, and buy replacement there. The hard plastic lines may have to be from dealer.

There are many vacuum lines under the hood to replace.

Two under the intake manifold
Front of the engine, two or three having to do with air pump
Front to the driver side, one or two havingto do with the advance timing
THere are two short hoses attached to the airpump that may be cracked.