these are the things that came to mind
1. rebuilt the repo to use the new/latest maven archetype
2. In addition to no.1, check dispatcher configs and the cloud manager configs
3. if ACS commons is in used, check what features needs to be redeveloped/removed
4. There's a more comprehensive list from adobe.com (which I can link later)
but I'm wondering if there are other things I need to know.
Thank you.