The one that has the red ring is well out of warranty as i bought it when the 360 was first released
None of my three have been modded, but all three have been opened at one point or another so none are under warranty anymore
I have looked into fixing it myself, but tbh im not keen on playing with electrical stuff, good shout on the place to get it fixed though
may get more than one fixed any sell the others off to pay for my xbox to be fixed