Yes, you would include the check of $2000 with your mailed 1040X.
However, the 1040X should only show what you owe in addition to what you already paid. Line 16 on the 1040X should show the amount you paid with your original return, and Line 20 should show the additional amount due.
You may need to go to FORMS and type in the $8100 you paid on Line 16, so that Line 20 correctly reflects the $2000 additional due.
@Bestvalue888
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