A Mity Vac is all you need. You do it by divide and conquer. The vacuum hoses is a just a network of hoses. Isolate those further back, like trunk, gas cap and back door and work on the front doors or back first. It looks like you have a leak on the lock and unlock circuit. The yellow hose with red marking lock the car, green marking unlock the car.
1) Lift up the carpet by the driver door and you will see some vac lines. Break off the T and put a Mity Vac on the back circuit and put a mity vac on it. The back door/cap/trunk should lock or unlock depending on which line ( green/red ) you attach the Mity Vac.
2) Repeat on the passenger side.
3) You should be able to isolate which door has issue.
4) You can isolate at each individual pod at the door by blocking it but it entails removal the panels which I normally do not do.
You will get a hang of it after some try and error.
Good luck.
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