1981 380sl 3.8l 107 vacuum diagram and other questions

[dima4855]

Greetings,
Took my car to the mechanic today for him to adjust the air/fuel mixture and the shifting points of the transmission. Everything looked good except (as some of you know from my previous posts that the heater/ac is not working and it has been determined that it's not working because of the servo). So I ordered the electronic replacement for it, but the mechanic told me that all of the vaccum lines under the hood are either not correct or are broken.
1. Does anyone have a vaccum diagram so that I can start from scratch?
2. Also my steering box leaks I will take it out to save $300 and pay the mechanic $150 to rebuild it and put new seals in it. Any pointers on doing that?
3. He also mention that my cruise control brain is fried and the replacement brain would be $250. Any recommendations to do that job cheaper or a place to get new module.
4. Lastly, the power antenna does not go up and down any suggestions on that? Even if press it there is no movement the same mechanic assumed that the whole thing needs to be replaced. Any ideas?