Hi, I posting for my son who has a DSL401. We need help please. He plugged in the other day and nothing ! The amp has been fine and given no indication of faults. Its not left the bedroom in over a year. Powers up but no sound on any chanel. Im no electritian and dont want to electricute myself but can do the odd repir. Replaced the pickups and switches in his strat. So basic stuff is ok. Dont have a multi meter. I checked the 2 fuses in the back of the amp and they were fine. Removed the amp from its housing and there was a 3amp fuse on the pcb that had blown. Replaced that and refitted to case. Still nothing. Just the red power light on. Checked power lead and guitar and guitar leads. Im now stuck. Cant get it looked at as we are shielding due to covid so any sugestions would be apreciated. Many thanks, Lee.