there's a report that spits out what's on every filter, grouping and view. It's not helpful, because the formatting isn't quite right--there's no way to parse it. But the one thing you can do is download the result to a spreadsheet and start doing some word searches, e.g. textmode=true for views and groupings, or "exists" (and etc.) for the filter column. I do encourage you to filter the list by the date the report was last used (and other stats)! Otherwise it can be a huge task. And then I think Doug also has a report on reports. The link below and the link in the link should point you to all the code. "https://one.workfront.com/s/question/0D50z00006Px3KPCAZ/"
https://one.workfront.com/s/question/0D50z00006Px3KPCAZ/ -skye
