I daisy chain my DD2s with my Rats. They always lit up bright and proud. Recently in one rig it doesn't light up at all (or if it is, so faint I can barely tell) and in the other it is visible but barely. They still sound great. Does anyone know, do the LEDs eventually go bad? If so do they get dim as they are failing, or would they or just fail outright? Are they easy for an amp tech to replace? Help?