Default Searching S3 16gb mainboard

Both microphones on my i9300 are failing so I am looking for a used but fully functional 16gb mainboard to revive it. It must be one that operates wit European SIM cards. If anyone has a somewhat broken phone with an in tact mainboard pls send me a pm.

Cheers

P.S. Hope this inquiry is ok .. in the forum rules I only saw that selling is prohibited.
Galaxy S4 I9505, Galaxy S4 Mini I9195, Nexus 7 3G