Got a 4-stop TAC20-03 giving me problems. Changed the 3 volt battery on the IOA board and lost floor 3 & 4 Hall & Car Calls. Floors 1& 2 work fine. The IO's for the CC and Hall Calls for 3 & 4 are gone from the IO map and I cannot add IO's in IMS when I right click in the IO map the option is not there. I can place Hall and Car Calls for all 4 floors from IMS and the car will go. No faults. Relearned the Hoistway and it passes. Have FCP for all 4 floors. Have been through parameters, but can't find what is wrong. Looking for suggestions on where to go next. Thanks
