Hi @Alias2971 and welcome to our community! 
I am not quite sure as to what you may be referring to as the body of your thread seems to be missing, but do I understand you correctly in that you wish to have the motherboard replaced in your Xperia M?
If so, then I kindly advice that you get in touch with your Local support team in order to be assisted in having it sent to an authorized service center. They are well informed regarding your local service routines, warranty terms and consumer laws and will be able to advice you further!
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