My Fender Roc Pro 1000 combo amp's reverb stopped working some years ago. Does anyone know how I can fix it without taking it in to a shop?

You need to fill the reverb tank up with some more reverb. I prefer some good ol' South Country IV Reverb myself. But check out Yester'Verb as well.
Check the RCA jacks attached to the reverb tank (unless your amp uses DSP reverb, it will have a reverb tank on the bottom, near the speakers) and make sure they're plugged in. If they are, try jiggling the wires.
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