Help with Esoteric SA10 problem

Last night after changing cds in my SA-10 the volume was cut by 80% like it went into a limp mode. It has to be cd because I run monoblocks and this effected both channels the same.
I tried
-changing my interconnects from XLR to RCA
-Pulling the plug and resetting
-Putting in my other cdp and it plays perfectly.
I have taken the player to a local Esoteric authorised repair facility and thus the reason for this thread
They feel it has something to do with a mute switch (there is none) so I am concerned that they have the skills required to work on this player. They have so far ruled out the power transformer or regulator.
Has anyone experienced anything simular with an Esoteric player?
Does anyone have any imput that may help?

Thanks and Best Regards,