I know that their plant out in Monrovia disappeared some time in the 90s
. Not sure if they're still in business or if they moved overseas.
I bet that any local TV studio has a copy in their library. You could call KTLA at (323) 460-5500 and ask for the guy who does their camera and equipment maintenance. They have a full repair shop right there on the lot. It used to be run by a Mr. Lee, but I think he retired.
Charles