Dead Pre-Amp. What's wrong?

[Daniel Grenier]

So I have a dead Fishman Presys+ PreAmp on my Martin 12 string. It is just past the twelve month warranty period (by 3 months) so I won't even bother with that avenue.

Question is: How do I test this thing to see what might be wrong? Are these even repairable units or should they just be replaced?

Thanks for your suggestions.

PS. No, it is definitely not a battery, cable or an amp issue.