OK...so...this is weird...

I haven't been listening to my SA-400 for a few days, because I just
wasn't that enthused about listening to my garage sale find when I
know that it isn't performing right.

ANYWAY...So I decide to listen to it today while I'm doing some
cleaning up.

I switch it on, and lo and behold, the FM Stereo indicator is back on,
and I verified that it is indeed putting out FM stereo again!

What gives?