User names from Wireless LAN Controller

Hi all
I'm trying to get a report out of a Cisco 4402 Wireless LAN controller, showing all the current clients on a particular WLAN profile, with their user name.
The Monitor -> Clients screen shows me all the MAC addreses, and I can filter by WLAN Profile Name to home in on the clients I'm interested in. When I click on a MAC address for more detail, I can see the correctly populated User Name on the Client Properties screen - so the WLC definitely knows all the detail I need...
Ideally I want spreadheet with a list of usernames of currently connected users (or even better, users that have connected over a time period). I can't see any way to export this data without doing it manually (and I have 270ish clients at any one time).
I've tried at the command line, with a "show clients summary", which at least gives me a table I can copy and paste into a spreadsheet, but again the username detail is only displayed with a "show clients detail MACADDRESS" - and the MACADDRESS field won't take a wildcard.
I've also tried examining the log files, and setting up SysLog to a syslog server - but I haven't observed user names in any of the logs I've seen.
The WLC is on version 4.2.176.0 - and doing an upgrade isn't very convenient at present - although I might consider taking the pain if a later release provides the funcationaility I need.
Does anyone have any ideas on this one?
Thanks!

Dear Scott,
I have some points to get clarified for step by step approach that has to be carried out during our downtime, or which is best option for this migration.
Is that the WLC running different code will be able to join Mobility Group. i.e. irrespective of Model and Code ?
1. Do i have to create a mobility group and include the existing WLC and new 3 numbers of WLC , thus when i remove the Existing WLC from the Group the Ap will try to get assosiated with other WLC in the group.
2. In WCS changing the Access point template configuring primary, secondary , tertiary Wireless LAN controller with New wireless LAN controller, during the down time this activity will be performed.
Which method or way to proceed during the downtime. Looking for your expert view.
Thanks .... Arun

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*spamReceiveTask: Sep 26 19:44:59.196: e8:04:62:0a:3f:10 Join Version: = 117465600
*spamReceiveTask: Sep 26 19:44:59.197: e8:04:62:0a:3f:10 Join resp: CAPWAP Maximum Msg element len = 92
*spamReceiveTask: Sep 26 19:44:59.197: e8:04:62:0a:3f:10 Join Response sent to 192.168.1.156:45510
*spamReceiveTask: Sep 26 19:44:59.197: e8:04:62:0a:3f:10 CAPWAP State: Join
*spamReceiveTask: Sep 26 19:44:59.197: e8:04:62:0a:3f:10 capwap_ac_platform.c:1216 - Operation State 0 ===> 4
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*spamReceiveTask: Sep 26 19:44:59.341: e8:04:62:0a:d1:20 DTLS connection not found, creating new connection for 192:168:1:158 (45644) 192:168:1:2 (5246)
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*spamReceiveTask: Sep 26 19:45:00.119: e8:04:62:0a:d1:20 Starting wait join timer for AP: 192.168.1.158:45644
*spamReceiveTask: Sep 26 19:45:00.121: e8:04:62:0a:d1:20 Join Request from 192.168.1.158:45644
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*spamReceiveTask: Sep 26 19:45:00.273: e8:04:62:0a:d1:20 CAPWAP State: Configure
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*spamReceiveTask: Sep 26 19:45:00.274: e8:04:62:0a:d1:20 Setting MTU to 1485
*spamReceiveTask: Sep 26 19:45:00.274: e8:04:62:0a:d1:20 Finding DTLS connection to delete for AP (192:168:1:158/45644)
*spamReceiveTask: Sep 26 19:45:00.274: e8:04:62:0a:d1:20 Disconnecting DTLS Capwap-Ctrl session 0xa06d6a4 for AP (192:168:1:158/45644)
*spamReceiveTask: Sep 26 19:45:00.274: e8:04:62:0a:d1:20 CAPWAP State: Dtls tear down
*spamReceiveTask: Sep 26 19:45:00.277: spamProcessGlobalPathMtuUpdate: Changing Global LRAD MTU to 576
*spamReceiveTask: Sep 26 19:45:00.277: e8:04:62:0a:d1:20 DTLS connection closed event receivedserver (192:168:1:2/5246) client 192:168:1:158/45644).
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