Hey line 6 fans and techies,

I have a problem with my AX2 212 I have had for several years now.  Haven't used it since it died in 2005, but it's been sitting in the basement waiting for me to get it fixed.  Yeah, I have been procrastinating for quite some time, and have since had several amp/cab setups.  I just would like to get it going for a practice amp here in the basement.

Here is how the problem started.....One day at practice, I went to turn the amp on and a bunch of funky stuff was on the amps display, as well as the floorboard.  No matter what I did, nothing changed.  Tried hitting footswitches, turn knobs, turn off and on again, and same result.  Tried hard reset, and still nothing.  Then after being on for awhile, both displays will shut off completely.  I would shut off and turn back on again, and still no power on display.  Leave it sit for several days, and it will power up and I can play through it for about 1 minute before it dies again.  Seems like a cold solder joint, or something funky in the board?  I have no idea where to start checking it.  Obviously it is temperature related, since once it warms up, it shuts down.  Anyone have any ideas?  I have a line 6 service center about an hour and a half away, but I'm not even sure if they work on amps this old still.  This thing is from the late 90's, and probably considered obsolete to fellow line 6 users.  Or maybe not?  Any advice or ideas are greatly appreciated.  I will probably end up sending it to the service center, but I'd like to figure it out for myself with some tests.  Maybe using a heat gun, and some of that aerosol spray that freezes, to see if I can get the problem to come and go that way.  Thanks in advance!

-Jason