Over-the- Range Microwave Lights and Nite Light

GE Profile Spacemaker XL1400 has the features to have Surface Lights and Nite Lights that illuminate the range top below the Microwave unit. Last week the Surface Lights feature was selected and the light were ON. No other microwave feature was in use. Suddenly the light on the right side went out, followed by a "pop" and the light on the left side went out.

ALL other functions on the key pad and microwave are working, EXCEPT the Surface Lights and the Nite Lights that illuminates the range surface below will not turn on when the selection is made on the Key Pad. I have replaced both the light bulbs…that is not the problem.

I have looked at the parts diagram but do not have an electrical diagram to determine if there is a separate circuit, fuse, etc. that provides current to the light bulbs.

Any suggestions?

I realize that at the 10-year point the best course of action may be a new unit; however, everything except the two incandescent light bulb circuit is working perfectly. The only suggestion I get from the local appliance store, other than buy a new microwave, is to get halogen "pucks" to put under the microwave to use as surface lights.