Did you find a solution for this Alex? happens to me occasionally, I just bury them deep
We were able to save 2 or 3 with Greg's idea. What we found actually on the majority of them, not the one pictured, is they are/were printed just fine. Centered and level, but the white threads/fleck/tri blend look actually were not level or straight. That in turn created a very serious optical illusion. You could hold the shirt and it looked like everything was dipping to the left. Break out the old tape measure and the print was nuts on. Of course, I'd expect nothing less from us...
We tried to figure out a way to explain that to the customer without looking like we are trying to pull a fast one. We did up a Illustration on the computer, printed it out and brought the tape measure. All in all it ended up OK. We replaced 2 that were really bad.