This is a known (albeit rare) failure point on the 757. It's not a huge issue, but can cause control issues and buffeting due to irregular airflow over the wing. Non-emergency diversion is the standard procedure for this.
Almost the exact same scenario was written up by NTSB in 2007, where a passenger was first to bring attention to the leading edge slat delaminating.
<https://old.reddit.com/r/unitedairlines/comments/1av0ssi/whats_happening_here/>
Almost the exact same scenario was written up by NTSB in 2007, where a passenger was first to bring attention to the leading edge slat delaminating.
<https://old.reddit.com/r/unitedairlines/comments/1av0ssi/whats_happening_here/>
sincerely,