Connect the Mityvac to the brown line going to the injection pump shutoff and pump it down. It should move the stop lever, and it should hold vacuum. If not, the shutoff diaphram is bad.

If that works, reconnect the line you just tested and connect the Mityvac to the other brown line that goes into the firewall. This one supplies vacuum to the key switch. With the switch in the off position you should be able to pump it down and again, have the stop lever go down and have it hold vacuum.

To test the AC system connect the Mityvac to the green line that goes into the firewall. It should hold vacuum. I can't help you any further than that because my 240D has a different system than yours.

The door locks are supplied by the two yellow lines. I wrote an extensive post last week describing how to diagnose leaks in that system.

__________________
Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References