I tried to locate mine today from above and below with an inspection mirror, I could see the front one barely and really couldn't tell the angle in the mirror, too much stuff in the way.
Found the lead for the rear one, but not the sensor. Mine isn't that bad since the GMPP base tune my tune is built from so if I have to take the TB or lower CP off sometime I'll dig further. I think they might have changed the sensitivity in the later tunes a bit. I know it got a lot better with the GMPP OS.