I think "relay" is the correct terminology for this component. I
thought they were referred to as "relay switches", but all sites I have
seen do refer to them as "relays".

I'll have to go in and take a closer look to see if there are any other
numbers on this panel to be able to respond more accurately. My last
trip up to the airport, I tried to document names and model numbers of
all avionics in the panel so I could provide better data. The audio
panel didn't have a name on it that I could decipher... All I could
recall getting from it was the info off the relay, including the
manufacturer and part number. I don't recall if there was any
additional information???

I also don't have any idea how old it is? I was surprised, however to
find that the relay for a second COM and marker beacon components were
removed. That's what I get for buying used and having it installed
sight-unseen! I'm learning some valuable lessons, the hard way!

If anyone cares, I will post an update after I've had a chance to get
up and look at the audio panel again... May be a few days...

Thanks again for the feedback!
Todd