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the k-1 showed 7642 in one place you changed it to 7462.   that's what's referred to as transposition error

when 2 digits next to each other are switched. the error is always divisible by 9

 

 

for examples 6742 vs 7642 difference 900

or 7624 vs 7642 difference 18

 

as reported in another response the k-1 basis worksheet confirms what was in my original post  tax basis 42k for which you received 42k so no gain or loss