I found a reference in the manual copy I have..which is actually for the 85-85 models, but close enough. I first took out the two 50 amp fuses, as specified.
I pryed the panel out gently, it is spring loaded at ends and top.
Once out, I removed the bulb from the holder in the slot..you unscrew the mount with a 1/4" socket, and pull out the cardboard tube that covers the bulb. The bulb is a 53 automotive, little tiny one. I replaced the bulb, and reversed the process.
I used the bulb from my refrigerator alarm spot- which had been disconnected anyway. Either way it is an easy repair.
I also had the chance to dust out the panel while out.