Arcam Alpha 3 Tuner - No Power

Hello.

I recently purchased an Arcam Alpha 3 tuner. It was not powering on arrival so got a refund, but can’t bring myself to get rid of it!

When plugged in the power button does nothing, no lights or anything. I’ve checked the plug fuse and internal fuse, both fine. I checked the power switch is working with a multimeter and all good. I did notice the supercap (0.1F) has popped but understand that’s to store channel presets.

Any other ideas on checks or what could be the issue please?

Many thanks!