i have replaced them all in my 90 including the ones on the transfer switch box in the back.
they are NEON lights and do wear out.
if you want the exact same ones they are easy to replace. i bought mine at the local frys electronics and some from a supply house online. like 3-5 bucks apiece depending on the color. i changed the color on mine to what i liked. blue is more expensive for some reason.
i know i had some spares but i am not sure where they are so i could give you part numbers. btw, they are called neon pilot lights. the old ones had silver rims on them and the new ones i got had white. since i replaced them all it didnt matter. you can find exact replacements for size. they are probably 1.5" long or so and have a metal slide over clip on the back to hold them to the panel. just remember to have the 120v power off when you are playing around with those wires.
tom
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