Have you taken the door panel off yet ?
Also, is the door fully closing and latching ?
If not, then the lock mechanism has to be forced down.
Sometimes this can be fixed with a door-striker alignment.
The sliding 3-way valve could be lubed, once you have the door panel off, double check the operation of all of the levers and look for binding. This is what happened to me, once I got the driverís door working, all of the other door worked great.
Good luck !