Please help. Bassbreaker 18/30 - NO SOUND!

Hi everyone, complete noob to message boards, so I hope this is okay. I have a Fender Bassbreaker 18/30 combo amp that recently stopped working. I played it for a gig one night and the next day, no sound. I get a little bit of noise when I plug a cord in and touch the end, but nothing with an instrument plugged in. I checked the inline fuse with a multimeter and it seems fine, I inspected the tubes visually and nothing pops out at me. All of the tubes glow orange when powered up, the preamp tubes only a little. I'm hoping someone can give me some idea as to what my issue could be. Thanks
 
Meanwhile - use the manual to divide and conquer.
Do you get signal at line out?
Do you get signal at FX send?
What if you feed a signal in at FX return?
Does it work if you plug in an extension speaker?
p.s. there's any number of signal generating apps for your phone. Or just put some music on (at the appropriate level)