Hmm I can clearly see an engine noise run at about 2 hrs into the flight near Williamsburg. I used Seeyou desktop.

Also from OLC FAQs.
1.18 FES aircraft with invalid logger recording, what can I do?
- For aircraft with a too low noise level, for example all aircraft with front electric sustainer (FES), the MOP level must also be recorded.
- Only the MOP2 sensor from LXNAV is approved by the OLC.