Hey everyone,

I'm hoping someone can help me troubleshoot a new piece of gear I purchased. I recently bought a used Marshall DSL40CR that was running fine, but just tonight the High channel stopped working. Low is perfectly fine, but Highstarted having a  heavily muddied sound and now I'm hearing nothing out of it. All tubes are glowing, but I figured I'd seek out some sage advice before taking things apart and potentially making things worse.

Thanks!