guitarnine

Has anyone experienced a sudden loss of output from either the left or right? I hooked up the RCA jacks in the back to an amp, and I only get sound from the left side. With headphones the same issue, just the left side, nothing from the right. Firmware is up to date, I've restored factory defaults, and everything prior to this was working fine for years. Anything I can try? Guitar, AUX and internal drums all only producing sound to the left - thank you!