While poking around looking at PR SUS channels this morning, I see that the M3 stage of PR2 needs it's Sat amp "rebooted" (aka cable unplugged and replugged back in has sometimes worked).  (See blue and green UL and LR which have gone noisy at high frequencies since May sometime.)  We suspect that if we look around we will find more of these which do not pose a threat until it is determined that they are a problem.  No action for now, maybe add it to a Tues morning task to try the power cycle.