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I don't have a write up but its not that hard, just a pain in the ass. All you have to do is take out the controls and replace the bulbs with blue LEDs and have a resistor in there.
Its a LOT of work. Lots of tedious soldering. Ive done this before, and will never do it again. If I was charging, I would charge $100 per bulb, thats how much tedium is required.