Good Morning All, I noticed a new issue with my otherwise great DSL 40C amp. Recently after traveling with my amp, I noticed that the volume on the clean channel dropped (volume at 10, gain 10, crunch ON would cause a very trebly scratchy sound, but the sound wasn't full at all). The other channels, wouldn't crunch, and the sound just seems very tinny and almost harsh. After some research (travel + floors sanded and amp cover was off when we returned), I assumed debris in the FX loop may be the problem. I did the jumper test and switched the loop ON and volume roared back (still very tinny, but higher volume). I removed the jumper, and with nothing plugged in the on and off button almost acts like a boost. The amp is a year and a few months old, has never been retubed, but is recreationally used. Any idea what would cause the FX loop ON to increase volume without anything plugged in? Any idea why when it's in the OFF position it would decrease volume? Finally, if this is beyond a tube change/biasing or simple ribbon cable fix, does anyone recommend any amp repair services in North Texas? (North of Dallas). Thank you!