Hi Roman,
While I don't have an answer specific to your particular microwave, in general the door mechanism is usually easily accessible once you take the main cover off. Look for screws on the back and sides; once those are out you should be able to slide the cover off toward the back. After that you should be able to see the door latch mechanism; it may take a little bit of wiggling and jiggling to figure out what to move to get it to open, but with a little common sense it'll become apparent.
Oh, of course you should unplug it first and stay away from exposed electrical parts; some of them are capacitors that can hold a big charge for hours. The wires going to the door switches will be reasonably safe with it unplugged though.
Good luck; let us know what you find!
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