I have a CS1000X .

The unit is only partially smoked. There is a problem in the final output stage, not enough to shut it down completely, but close. The DDT light indicates that the amp is outputing full power. I suspect that there is a partial short that is presenting itself as a low impedence load to the output amp section. This is causing the amp to work really hard and thus the DDT light kicking in. I think you will find 1 transistor shorted or partially so. Replace ALL of the output transistors for that side and that should resolve the problem. Check the driver transistor pair as well. It is important to replace all of the transistors on that side, even if some check OK with a checker.

Dan