How to change the favicon for the wiki server in 10.8.x

I am new to Mac OS X Server and I am trying to replace the default apple favicon.ico for the wiki server in OS X Server 10.8.2. I have created my own favicon.ico and would like to use it on the wiki. I have put my own icon in the /Library/Server/Web/Data/Sites/Default folder - and renamed the apple version of the favicon.ico that was already in the folder. My new icon works great on the default web page - but only when I turn off the wiki service. It seems the wiki service has its own favicon.ico file (somewhere) - but i cannot find it. I have searched the entire system and can only find a few other occurences of favicon.ico file containing the apple logo - most of which are in the contents folder of the server.app app. I did not try to change these. There is also a folder /Library/Server/Wiki - but specific folders within it seem to be protected and I am wondering if that is where the favicon for the wiki might be located. I am assuming that root needs to be enabled to see these files. Any suggestions on where the wiki favicon is located and can it be replaced?