Help with radio code.

Hi I've recently bought a micra c+c but need a radio code for it. I took it to a local car audio shop to be decoded but now after nearly two weeks they have told me they are unable to decode it and Nissan would have to do it Before they replaced the stereo I asked them for any serial numbers on the stereo which are :

Pp3001mb
28185bg10a

Any help would be greatfully appreciated.
 
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