Your post has two distinct model numbers shown, so it's hard to be precise, but I'll try my best.
You can usually find helpful exploded view diagrams and order parts by entering your full model number here:
http://tinyurl.com/gv383I have a diagram at my site which helps you find & replace many GE cooktop and cavity light bulbs. Other models are similar. It's at
http://207.234.249.73/mwd/ge_lamp_replacement.jpgAlways unplug a microwave before removing or installing any bulbs!
If it's an over the range type, remove the vent grille across the top and see if bulbs can be accessed there.
There may be a panel on the bottom covering the light(s), too.
If not, chances are you'll have to remove it from the wall, then remove the outer cover.
Many models use halogen lamps. You must not touch the new one with your bare skin, as the oils will shorten the bulb life.
If yours is an Advantium type, the following instructable should help:
http://www.instructables.com/id/SZFF4WSF44XYT8X/?comments=allWe're happy to help and we appreciate your thoughtful rating of our answer.
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