I've never found a report that tells you exactly what was done.
But if you go into CMS Supervisor and navigate to Tool, then Maintenance, select the Report tab and run the ADC Administration Log Report. Run it for a time period when you know it was there to when it wasn't and see if it gives you any clues.
- Stinney
“The man who asks a question is a fool for a minute, the man who does not ask is a fool for life.” - Confucius