It has been a while since I looked at the underside of my unit and it is much nicer than I remember. Here's a Google album with a couple photos of my unit.
Beltron 2972E Google Photos
Is that 10 ohm resistor in your unit mounted on the trace side of the board? I didn't remove the board when I took these photos but I would have when I drew the schematic. I would think I would have put it on the schematic if that resistor was in my unit.
As to the shorts light, that's something that isn't mentioned in the instructions pasted to the document pouch in the lid. My unit came with all of the paperwork including the "Beltron Promotional Kit" which contains some better instructions. The shorts light will remain on as long as the tube does not have a heater to cathode short. I'll try to get these instructions scanned or typed up into a document and post them.