Got the Apple Color Monitor open
Finally, with a bit of looking for hidden catches (under the front feet) and so forth I was able to get the back off the chassis. That exposed the CRT. It was a Samsung (part number later). Unfortunately the surplus BandK CRT rejuvenator did not have the proper connector for the CRT. One or the other was probably too old.
Right now stuck on getting it back on. Watch out for those plastic tracks.