I filed a return after form 8615 was revised. I now see TurboTax has changed the tax due under form 8615 on the same return. What should I do?

It depends. You may need to file an amended return with the updated amount. 

Click the links for more information:

2019 Form 8615, Children who have unearned income , Instructions

How do I amend(change or correct) a tax return already filed?

Thanks.  I suspected I would need to amend the return.  The reason for the amended return will be an incorrect 8615 calculation - by the Turbotax program.

Further to my reply to your answer; since I filed the original return with the understanding that TurboTax was correct (the previous 8615 notice was removed), why should I acknowledge the current program is correct?