Hello, I am using Genz Benz Shuttle 6.0, yesterday i was play at home, Genz Benz to my pc from DI output, i was play it nearly 1 hour. and Tube Gain:10 Preamp Volume:14 Master Volume 12... When i playing, suddenly Thermal Led is on. But there is no sound changed... Only Led is on. But there is no reason for it; amp is not overheat, fan is still good workin, i was using DI output. After few minutes i was try to Headphone output there is no voice! when i open volume full from headphone output. i heard only distortion. i dint try it with Cabin. But still Thermal Led is on! on Manual Says; The red THERMAL LED indicates that the amplifier has over-heated, engaged the protection circuit and shut down. This circuit is self-resetting when the offending condition is corrected, i.e., blocked fan vents, stuck fan, 2 ohm operation, etc. But everthing was OK. But Led is ON! PLS Help Me. What is the Problem???