You should contact Source Audio to see if they can assist. It may not be a warranty fix since you bought it used but they aim to please their customers.
maybe i'm being a pessimist, but I think the amount it would take to send it somewhere would be more than the pedal's worth. kind of bummed I bought it to use it for a project, never used it, shelved it (in the original box), took it out to use and it didn't work. I used it maybe once. Me as an old school person, it's just, I would never buy another pedal from them because of that. (seems shoddy) With all the manufacturers out there of fuzz, distortion type pedals, I'd rather put my money somewhere else. For example, i've had a big muff worked great for years, it's a tank.