My XLS 402 emitted a small puff of smoke last night. The power lights flashed rapidly when this happened. This morning, I took the cover off and checked for any visual signs of burned components, etc. Finding none, I hooked the unit up. I can find no problem in the operation or sound in stereo or bridge modes. I am speculating that some sort of protection circuit malfunctioned, but the unit seems to be working fine. I am somewhat hesitant to use this unit in a show until I figure out what happened. My particular unit was manufactured 01/06 so it is out of warranty. Anyone have and ideas? Also I would like to get a hold of a schematic for this unit.