I just ran into the same problem with the identical microwave (mine was installed in May of 2005). Did you get a resolution?
I have removed the entire bulb housing and found that those geniuses at GE *glued* the bulbs into the sockets! No wonder both bulbs broke away from the base. It looks like they want to get a service call to replace a light bulb. What a crock.
I'm planning to replace both sockets and bulbs but can't find the part numbers for either. I have an email into GE parts to see if I can find out what they are. I'll reply again if I get this worked out.
For reference -- I did find a diagram of the microwave and the parts I need are labeled 29 and 31. Here is a link to the diagram:
http://genet.geappliances.com/IPCNet/Dispatcher?REQUEST=IPCNETGETPDF&file=00000000/00029700/00029702.p01.pdf
ski-dc
December 2008