If you burned up microwave oven's strip you may replace it with a new one on your own. Manufacturers of all well-known microwave oven brands use micaceous laminate. It is of limited life because it is produced with the use of the binding that tends to degrade and lose its properties under the influence of temperature and time.
Strip burns through, cracks and falls to pieces.
We sell plates of natural mica, life and qualities of which are much higher than those ones of mica plates. You may cut out new strip in the form of an old one and set it in a microwave oven. Mica is easy to treat under household conditions. Specific equipment and instruments are not required.
Workshop strip replacement (except for warranty repair) will be much more expensive and much longer than household strip replacement.
Ease of operation is confirmed by the fact that women themselves bought and changed strips. The key point is regular socket disconnection of a microwave oven as well as any other electrical appliance when being inspected and repaired.
The interesting fact is that repair shops do not acquire natural mica aimed to repair ovens though understanding the difference in life between micaceous laminate and natural mica.