I'm looking for a copy or a scan of the Williams 1998 Service Bulletin Book.
Or copies/scans of the service bulletins numbered somewhere between 104 and 107 for Medieval Madness (subject: Wireform Adjustment) and NBA Fastbreak (Subject: Link Kit).
For several years, I've been slowly adding every bit of documentation I could get my hands on for every manufacturer and add it to pinwiki as once central, convenient location.
https://www.pinwiki.com/wiki/index.php?title=Williams_WPC#Service_Bulletins
Note: I'm aware of the current listing on ebay from gameboardsoc1234. Unfortunately, he seems to have blocked me for some reason, so I can't obtain that copy from him.