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I could be wrong, but I *THINK* for a 1120-S all you do is prepare the return as it should be and check the amended box.
If it was a 1040, then this is what you do, but I don't think this applies to a 1120-S:
- Prepare the return exactly as originally filed.
- Check the box to amend and check the year (and any state amended box as well).
- Make the changes.
- File by mail.