Product review (5 stars): It's easy to change the light bulb yourself!
After reading the mixed reviews for this oven, the only unfavorable ones complained that if the oven light needed to be replaced, the unit had to be taken down from the wall. Well we purchased one anyway because to save $175 or more, I would have no problem taking it down myself to change the light bulb; it's not that hard.
We installed it, and wouldn't you know it, ...it stopped working after one successful test. We phoned the GE appliance department, also easy to do on-line, and they were here the next morning.
The repairman opened the oven by removing the grill from across the top. Two half-inch screws hold it in place from the top edge.  He was then able to open the front control panel so he could adjust a misaligned door switch. He did not have to take the oven down from the cabinet.

Here is the revelation: the halogen light-bulb, in question, is located behind the grill right beneath the opening where the charcoal filter would be mounted, if you used one.  Anyone with a Philips screwdriver can take these two screws out and save himself or herself a $175 service call.
The repairman suggested that we leave the screws out to make it easier next time. The grill fits snuggly without the screws.
When our new kitchen is finished, we will give it a hard test, like cooking with the microwave and the convection oven combined. For now, we are giving it five stars because it appears that this is an excellent product and the repair service is terrific.
This review will be revised if any of this proves to be untrue later in time.
<a data-hook="product-link-linked" class="a-link-normal" href="/GE-Profile-Spacemaker-Series-JVM1790SK-1-7-cu-ft-Over-the-Range-Microwave-Oven-Stainless-Stee/dp/B000UW0LUC/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">GE Profile Spacemaker Series : JVM1790SK 1.7 cu. ft. Over-the-Range Microwave Oven - Stainless Stee</a>