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.
maybe just a loose wire?
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.