Sound only on passenger side since new amp

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Hi All

So I have recently had to get an amp off ebay for my Audi A5 which has a B&O system.

My AMP had died.

I have now fitted my AMP from Ebay and have sound, However the sound I have is only on all of the passenger side. I do not have any on the drivers side front or back.

I have been advised it could be the T Harness, Which I am getting checked this week.

Any other ideas? Or any ways I can check without spending a fortune.

Thanks

 

[Booboo]

It's in component proection mode
It needs to be coded in. They'll check the database to ensure it's not stolen, if not they'll code it in.
About £80