-ceramic at the bottom is broken,-Interier panel needs to be changed

Some are, yes. There are alternatives used, such as aluminium oxide.

Beryllium oxide is safe enough in a solid form, but is toxic and carcinogenic as a dust, so it is best not to handle broken pieces, and you must avoid trying to shape it.
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Normally you have to separate the door panels (as shown in the attached photo) and then you'll see the screws you need to remove.

Or you can watch a YouTube video (not a video I made) here that demonstrates how it's done.

You can find handy exploded views and order parts by model number here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

you may have exposed metal in the microwave so it arcs. You will need to cover the exposed metal with ceramic paint. Just sand the area down so its smooth, then apply ceramic paint. that should solve your problem.

on the inside panel or bottom panel there is a fuse in there once you pull the panel you will see it, it is more than surly burned out and needs a new one thats all, but the company dont tell you that because you wont buy aother if you can fix the one you have ffor less than a buck

The bulb is positioned at the top of the oven, accessible only from the outside. You'll need to pull off the top and bottom trim strips, remove the bottom trim strip locators, remove 2 fixing screws from the left edge of the oven (with door open), and the 2 fixing screws from behind the top trim strip. The oven should then just slide out. You only need to pull it out 6 inches or so to gain access to the bulb cover. You'll need a T20 driver to remove the cover, then the bulb unscrews as it has an SES fitting. Bob

first unplug your microwave and let sit for awhile to drain any stored energy that may zap you. then, if it is an "otr" there are 2 screws in the vent slats on top that you remove. once removed, you lift up on the control panel and it tilts out. voila! there is your fuse. pop it out and pop in a new one. ceramic 20 amp is correct. check your old fuse to be sure it is 20, not 15 though.

Took microwave out, opened back, 15amp fuse blown. Replaced all ok.

TIP: Go to the web and type www.partselect.com enter your model number then scoll down to your part. Panel,door (PANEL DOOR) click to enlarge exploded diagram on left. Veiw enlarged diagram at top of page. You can print the entire diagram for exact assembly by holding your pointer in the upper left hand corner of diagram. Select the print icon. Now you have what you need. If you found any of these suggestions helpful, please rate my solution. D. Lange

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

There should also be a "mini-manual" hidden inside the unit behind the control panel, which is very helpful when troubleshooting.

We're happy to help and we appreciate your thoughtful rating of our answer.

Nom...you probably blew the internal fuse. This time...turn off the power. Remove the button panel and search for the blown fuse. It might be ceramic or of some other type. If on a circuit board, there will be a xxxA with xxx indicating the amperage. Use a multitester available at Ace or Radio Shack to test. Replace with the same kind of unit. Your local auto store, appliance parts guy, Radio Shack or Sears parts can get you the part you need. Show them the old one.