Hi Gareth,
Thanks for the reply.
I've had a look around the amp, does not seem to be any signs of water ingress on or around the area of the amp. I also looked in the spare tyre bay, nothing there. I had a look around the fuse box in the right boot compartment, and no signs there.
I optical bypass connectors, removed the black optical wire from the amp, used the bypass connectors; this resulted in no blown fuse, MMI display works as needed, just no sound. However, with full, normal connection, the fuse blows.
Regards,
JP