NZGuitars.com

joys of digital chips, micro double sided boards and hot dipped microscopic components, they are never going to last like an old analogue pedal, heat moisture and vibration kill them
it wouldn't hurt to dismantle it and give it the old oven bake, certainly works for xboxes, graphics cards etc, sounds like moisture or tracking across some of the circuits rather than something actually blown.

Thanks for input and suggestions. Have sent to Polar Bear as a result of his kind intervention.