While working in the CER rack ISC-C3, I noticed that that 24V LED on the rear panel of both the 35.5MHz and the 80MHz RF Oscillator Source's were not illuminated while the 9.1Mhz, 25.5Mhz and the rest of the sources all have illuminated 24V LED's so I measured the 35.5MHz and 80MHz signals out of their respective RF Distribution Amplifiers and they look good therefore this may be a non issue, but it seemed worth noting.