Can anyone help? My GK 210 amp, which I have had for 3 tears now and love, failed on the last number of my last gig. The blue light around the switch turned to a flashing red and continued flashing for a while even when I switched it off. Since then I have tried it again, the light turns blue as normal and the amp sounds fine for a short while but then it cuts out and the light starts flashing red again. Anyone had this trouble? Is there a fix?