I have a pair of Penta MK1 with one kind of minor problem, the "door" (where the controls for sensitivity, bass level and power mode) can't be closed. When I press it to close it, it just clicks but it never locks the "door", it just opens at once. I wonder if anyone knows how...

Hi all, I have posted questions related to this issue in the General Forum, but I guess this is the more appropriate forum for things B&O which have died... I have now spend hours working on this Penta III amp unit and have had no luck. I began with the powerlink cables, and the BC9500 and can confidently...