Light plant questions

Glow plug indicator. Anyone know if these stop working, are the plugs disabled? It appears that might be the case by my research, but I haven't put a meter to the plugs yet to see if there is voltage when I turn the switch. I wouldn't think this little Mitsi would start at -5F without any plug action, but it does, even though it sure doesn't seem to like it.

I just went over to the plant, had to swap a light bulb out, and start it for the last night lighting our town's outdoor skating rink. I did swing the control panel open (of course, twisted off two of the three screws), and discovered the plug indicator had a bunch of melted plastic in it. Looks to have dropped down from the little board above it that holds the ballast LEDs, obvious that's the reason they don't work. Made sure all the little coils were clean and separated, checked voltage, it appears to be wired in series with the plugs. 11.4 incoming, 10.1 out. Didn't have enough hands to get a lead on the plug strip. Held the switch for 20 seconds, coil didn't get red that I could see.