Well, I've cluttered up this thread plenty, but I want it to be useful, so here's the latest...
I was able to remove the "Warning Indicator Assembly" using Jack's Windex idea (thanks, Jack!!! Also works for removing stubborn wedding rings - no, not for the reason you think ), so I've taken some photos with everything apart.
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Now that I have changed all the bulbs with the Warning Indicator Assembly off the bike, I see that it's unlikely that I would have been able to do it any other way. Once I got the rubber boots off, the Low Fuel socket came right out of its housing, but the other two were so tightly wedged in there, I had to use a real solid grip on the assembly, and pliers to pull hard the sockets, with a twisting motion, straight out of the housings. If I ever need to change a bulb there again, I'd definitely remove the assembly - Windex and a little wiggling and persuasion helped me pull it right out of the nacelle (the rubber bushing came right out with the assembly).
According to the auto electrician I showed my assembly to, a hair drier is the way to go when removing bulbs from the assembly. Heat up the plastic housing and then you can pull out the sockets. I will try the windex idea though - I had to replace the housing under warranty and completely wrecked the original getting it out.