There have been 5 releases since 220.127.116.11 and the latest release is 18.104.22.168 It is usually recommended to not get too far behind on releases due to the number of bug fixes and enhancements in each new release. While the versions of WLC,WCS and Location that you are running are supported, 22.214.171.124 was released when the 3.x train of controllers was out so that is a bit of a "Red Flag". If you ever have a problem that requires TAC assistance they will almost surely ask you to upgrade to a much newer version right away.
These release notes describe features, enhancements, and caveats for software release 126.96.36.199 for Cisco Location Appliances. This release of location appliance software supports both Cisco 2700 and 2710 location appliances and operates with Cisco Wireless LAN Solution versions 3.2, 3.1, and 3.0.