| I machined off a piece of the carbon sheet to expose the tube.
The white and red dots on the top indicate where we had seen the leak. The red mark along the bottom is where we saw some feature on the inside of the tube with the borescope. Click on any picture to get the full-size image → | 
|
| There looked to be a remnant of a wet spot (outlined in red dots), and pieces of carbon bonded to thesurface there. These did not blow off. | 
|
| Closeup of this region. In the dark area, many more specks of carbon are bonded to the surface than in the other areas. (Microscope images are upside down) | 
|
| Closeup of this region. | 
|
| I believe you can see the gain boundaries here. | 
|
| We tried to dislodge one of the specks, but it wasn't easy. You can see the scratch marks around the speck. Looks lie the specks are bonded to the Aluminum. | 
|
Hubert Van Hecke Last modified: Fri Jan 25 21:21:12 EST 2013