I have done some vacuum testing. I tested line 5 and 13 from the vacuum distribution block in the passenger footwell. I pulled a vacuum on #5 and turned on the key, switched to the footwell heater, and the air started blowing from there. I pulled off line #13 to check the vacuum resivour. No leaks there either. #7 pulling from the block took a while to get a vacuum, but it seemed to hold. What would be the next test? Where does the vacuum come from for these operations?? Off the engine?? If so, where on the engine??

Also if it helps, but I'm not sure it's connected, the transmission shifts a bit hard. Like on my 300 SDL when the vacuum line came unplugged.

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'95 S320 LWB
'87 300SDL
'04 E500 wagon 4matic