Wireless devices on RFK5501 keypad with PC1864

I am trying to figure out existing alarm in new house. I have installer code. It is a PC1864 with two RFK5501 keypads and three RFK5500 pads. There is no wireless module at panel so I presume the four wireless smokes (zones 21,22,23,24) are connected via one of the RFK5501 keypads. I have a persistent ZONE FAULT trouble alert that does not prevent arming and normal function. When I press the * button for more info, it says there are no zone faults. I am presuming this is likely a wireless smoke issue and want to trouble shoot that first... 1. How can I determine which RFK keypad is hosting those devices and access them? I am confused as to ho to enroll wireless from these wireless enabled keypads; can you host some from one and others from another? 2. What is the best way to test each wireless connectivity. I would presume if there was a serious issue there would be the appropriate zone fault. Can I go into the 002 zone programming and null out each wireless one at a time and see if the trouble resolves?