Hi @thorleif Interesting that you’re having sealing issues, sorry about that!
Something you can try is to apply a slight positive pressure to the inside of the WTE via the vent penetrator port and applying a soapy water solution to the areas around your penetrators and other seals. Also apply it to where the cables are epoxied into the penetrators. If you see bubbles, then that points to the location and defective part.
The other more painful way of doing this is to remove a penetrator at a time, blank it off, and re-conduct the vacuum test. A process of elimination will most likely find your defective penetrator.
If you find the location and it is a manufacturing defect, please e-mail us at support@bluerobotics.com and we can get you a replacement component.