so any of the mentioned calls do not cancel when at that floor? if the calls don't cancel, they will not drop out ca. , if they are not cancelling, make sure the 500 ohm resistor in the call circuit is good, if it is open, call will not cancel. if it is good, then make sure the wiring is correct, the right side of resistor on print goes to ground thru the nc p relay contact.
if all the other floors work ok, then we know that the p nc contact is good, double check the wiring in that circuit those little wires may have separated in that circuit
also some of the old reliable controllers had tiny little push buttons on the panel for the calls, they notoriously stuck in something to check as well

Has anyone taken calls on this job prior to you getting stuck with it? I can't recall if the CIR relays you mention are akin to those stupid Midtex plastic encapsulated type that Amtech used, but if they are, and some one has taken trouble calls on this unit just before lucky you, I'd bet somewhere one or more of those little teenie weenie flimsy contact pins has been bent over, compounding the original trouble. This controller uses 1s, 2s, 3s etc. for floor position? If so, I'd also be looking there.

Thanks guys, I will try those things.