It's not necessary to take the door panels off to diagnose vacuum leaks. With your MityVac, you can test them all from the lines in the floor. I wrote an extensive post that tells which lines go where.

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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