It has been a while since I've looked closely at the switches, but I do remember thinking I was lucky to get the wires repaired outside of them, because the guts were sealed away in potting compound. At least the knob switch was, if I recall.

Maybe the problem of weak operation is happening because there's a short holding the lock relay open while you are trying to operate the unlock relay. Or, perhaps the ground wire is broken in the door jamb.

Try to isolate the two switches from each other and see which one exhibits what behavior.
--
Art Benstein near Baltimore

Without geometry, life is pointless.