Go to the county page in question, then click HISTORY on the menu to the left under COUNTY HOME. That will give you a rundown on what was changed. Chances are if you don't see any frequency changes, the "update" was housekeeping done on the Wiki page.
EDIT: Just took at look at Waupaca County, WI which I believe is what you're looking at. It was housekeeping done on the Files, which are now part of the Wiki for that county (found under the COLLABORATE link on the menu).
Quote:
[Waupaca County Unit Numbering] Code list deleted MikeOxlong 2009-10-23 07:10:36
[Waupaca County Fire/EMS Pager Tones] Code list deleted MikeOxlong 2009-10-23 07:10:34
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