Wow, I'm a little worried now. Turned amp on, in standby, and let it warm up for a couple minutes. Came back to turn it to on, and main fuse below power cord blew. Of course I don't have a spare 2A 240V fuse lying around, so now I'm dead in the water until tomorrow. Being a DT25, I wouldn't suspect the transformer issue that the DT50's had, so I'm a little worried. Unless it's just a bad fuse, I'm not sure what else to do.
Best Part? Warranty expired 8-26-13.
Sent a support ticket in anyways to document the issue, and hopefully Line 6 will cover any necessary work because they have always treated me very well in the past. I will assume the best and prepare for the worst.
Perhaps Technical Bulletin #59 DOES apply to DT25's...
Let you all know more as my saga continues. Looks like I'll need to make new tones and go FOH for the cancer benefit my band is playing November 5th... Fun!