actually looking at your image in the dark shows up a lot more of the problem than just in the top-right corner.
cover your hands around the screen, or if it's night, turn off all the lights, and look at the image again.
you can see these small dots down the length of that pipe.
make the surface for this pipe double-sided, and then re-render the scene. If you get a clean scene then you know it will be that you have some polys that have reversed faces.
do not keep the surface dbl-sided as this will cause the inside to be rendered and you cannot even see this so it is pointless.
~~CM!
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