Not a self-build, but help required...Maxon OD808

[Jeast78]

Recently purchased a Maxon OD808 from eBay, but when it arrived it had developed a fault.  See in this video - https://www.youtube.com/watch?v=BwFOx6xHQ7k

In the video it sounds like no signal at all is making it through, but in actual fact there is a very tiny amount of level coming from the amp when the pedal is engaged.  There is also a fairly significant amount of mains buzz when engaged.

Any idea what might cause a fault like this?  I have built pedals in the past, so have the tools to test and possibly repair, but would appreciate advice on where to start.

Thanks.

[Kipper4]

Did you get the DMM out and test the voltages?
Have you got an audio probe?

[PRR]

Symptoms like that, I'd bet on a busted wire. Get a bright light and maybe a magnifier.