#2... the push the lock down others go up. Someone has got the vacuum lines backwards and they need to be switched (there are 3 lines). The "valve" is just below the lock inside the door panel so it needs to come off. One line pulls constant vacuum and the other two pull vacuum to either lock or unlock the other doors depending on the position of the drivers door lock. A mityvac or just sucking on the lines will tell you which one does what and you should be able to figure where to put them.

It's easy enough to fix the locks so I would just do it.... sounds like they all work.

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1985 300D Turbo ~225k
2000 F350 (Powerstroke) 4X4, SWB, CC, SRW, 6spd ~148k
1999 International 4900, DT466e (250hp/660 ft/lbs), Allison MD3060 ~73k