Andres reported that the analog video feeds in the control room weren't working.  The matrix switcher in the MSR was plugged in, but did not appear to have power.  I unplugged it, waited a few seconds, and plugged it back in and it powered up.  There was nothing that looked amiss with the power supply module or any of the boards accessible from the front of the chassis.  It may have been a power glitch, or the power supply is getting flaky in it's old age.  It appears to be a modular type under the cover, so it may be easy to replace if needed if it is still available commercially.