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Funny story, I once purchased an Eventide H3000 in non-functioning condition at a garage sale. Opening it up and exercising all of the connectors and seated components was all it took to bring it around. Every so often, I need to do it again, but that upkeep labor cost is vanishingly small for the results.
I understand that there is a level of intimidation involved. Being aware of your comfort zone/limitations is healthy, but any repair is going to involve a level of risk. That it is an intermittent issue indicates the important parts are probably in operable condition, and this is just the matter of sleuthing out the disconnect.
If maintaining that operable condition while physically examining the instrument is currently outside your skill set, internet answers are going to be meaningless and you would be advised to seek a tech (in the human/meat world). Such is the way of hardware.