Whenever bors appears in a commit listing or a comment, it produces a link that points at https://github.com/app/bors (notice that it’s singular). This link gives a 404.
Thanks for the report. We’re tracking a fix for this, and we’ll report back once it’s all set.
Hey @notriddle . The team deployed some changes which should have fixed this problem. If you can still reproduce this — please let us know. Thanks again for the report.