My microwave is heating fine and it is fixed in the island cabinet. The lights are out in the microwave. I am guessing its just a bulb that I need to replace or may be a fuse. I can't find any YouTube videos on replacing the light bulb. I'd appreciate any help.

Page 33 of the Wolf Use and Care Guide offers the following useless advice:

"Interior light does not work • Light bulb is loose or burned out. Contact Wolf factory certified service."

If your microwave is like most others, you will need to remove the outer cover to get to the bulb. My microwave is mounted over the stove, and in my case I think I would just learn to live with it.

https://www.subzero-wolf.com/-/media/files/united-states/product-downloads/discontinued-products/wolf/standard-and-convection-microwaves/convection-mw-ucg.pdf