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Ok you have possibly 3 but 2 forsure. 1-being the magnetron thats what heats the food. The other being the micro door switches the other being the little motor that spins the turntable.
Sorry but since you have no m/w experience then my suggestion is to call for service all because that even with the m/w is unplugged there are components that still holds a charge of 5000-8000 volts. Even then its gonna cost you over $300.00 if not more to fix this.