Mercedes Benz repair: vacumm locks, vacuum lines, side doors

Question
My 97 s 500 drivers side front door and trunk won't always function properly but the passenger side doors and drivers rear door do pull the door in all of the time any thoughts

Answer
you have a broken line off the vacuum pump trace the vacuum lines and make sure theyare not kinked or damaged otherwise take a vaccum gauge and check the passenger side of the pump then check the drivers side if they are seperate adapters you pump is either failed on the half or your line or t adapter is shot