Amending a 2023 e-filed return

[RWG1950]

I e-filed a 2023 return on 10-12-24 with a dir. dep. refund of $2,284 shown. IRS adjusted the return to show $2,626 refund.
This taxpayer's return showed several limited partnership K-'s of which he was a passive investor.
No notice received from IRS yet on this but I called the practitioner hotline. The person said the issue is with the passive
losses of $2,879 that were (allowed by IRS ?) on schedule 1 line #5, resulting in $342 more refund.
As this net loss was passive, it should not have been allowed to reduce income - and wasn't on the return as filed.
(I must have screwed up somehow on the "E" page 2).
What would be the best way to clear this up and give the IRS back the $342 ?
I'm thinking 1040-X, revised "E" page 2, 8582 & sending a check. My software won't allow an amended e-file once an original has been filed.
Thanks for comments.

[terryats]

I would wait for the IRS notice explaining the adjustment, and then call the number on the notice

[FEDUKE404]

I would not amend anything until you determine where you and the IRS differ. . .they COULD be correct in their adjustments.
The first thing you should do is to carefully verity the 2023 Schedule K-1 entries, and coding, and then look around on Sch E page 2. Assuming there was a 2022 Form 8582, you should carefully review those numbers and same for 2023.