The inside finish on the oven door is coming off--is this harmful?

Yes, if it really is operating the magnetron and generating microwaves, but that is "virtually" (nearly; almost) impossible, because all microwave ovens come with a special door switch (called a monitor switch) whose job it is to cause the internal fuse to blow and kill power to the microwave. It is more likely that just the fan and light stay on, but not the magnetron, and that is caused by a different defective door switch. (All microwave ovens come with 3 or 4 door switches, and they all must work right for your microwave oven to operate.) You better call a professional repairman to have that microwave checked & repaired.

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open the microwave door, look for a silver rectangular plate inside,try cleaning the plate with a damp cloth.

Pretty sure its the door interlock switches.
you might need a service call from the authorized rep.... sorry.

replace fan switch

Hi, For any repairs involving door latches on microwave ovens, I strongly urge you to get a certified service technician to replace and adjust the door for you as he should have a leak detector to verify the fix. Not performing the leak test could expose you/your loved ones to harmful microwave energy if not setup correctly

The door has to be split to replace the handle. The problem is that the door and seal are treated to prevent radiation leakage from the oven. Threat the inside of the door with extreme care because microwave rays are harmful.

door doesnt typicaly come apart, door should be replaced. it is a barrier for harmful waves.

To access the door handle mounting screws on MOST microwave ovens, you have to remove the inner door panel that goes around the perimeter of the glass. You can use a small screwdriver to carefully pry the plastic up and work your way slowly around the perimiter of the glass. Most microwave ovens also have grooves in the panel that you can insert the screwdriver into. Use care not to pry against the glass. The glass is tempered and also has an RF shield that prevents harmful microwaves from potentially harming the consumer. If you break the glass, you will need to purchase a new door. You will find the screws behind the panel.

If you have questions, please let me know. I hope this helps you.

HELLO' WITH IT BEING INSIDE A MICROWAVE I'LD ALSO BE WORRIED ABOUT RADIATION POISON SOUNDS LIKE ITS TIME FOR A NEW MICROWAVE

You will have to look at the hole picture to see if it cost feasible to have this repaired under warranty.
If this is tripping a breaker you should not use it. But for the most part it would be better to look at getting a new one.Sorry there is no easy way to take care of this, so I hope its under warranty and they replace it for you.