The key question are, can you hear the P25 buzz on the 996?
If you do Hold+frequency+Hold you should hear the buzz or it should start to decode it. If you only hear the buzz and 996 doesn't mute and starts to decode then it's probably a simulcast system that are difficult to decode for a normal scanner. Unidens SDS scanners could then be a solution.
I hope that NC CAP are a system name and not a DMR system type as you then would have to get the DMR upgrade.
/Ubbe