This is a bit complicated when it is Roth. I knew there was a recent discussion for such a past-due event, and I found it here:

https://proconnect.intuit.com/community/tax-talk/discussion/reporting-earnings-on-excess-roth-contri...

I put some reference links in there, which should be helpful. There is a known strategy to suck up the 6% penalty when the other Roth rules might make it advantageous not to make the corrective distribution, just because someone found it.

Have fun reading. It's a lot of details. Take it one year at a time, and that might be easier to work through.