Hi B+O specialists

I bought a pair of BL8000 : One with a brumm , but otherwise ok,  one with no light. 

i opened the BL 8000 with no light : Powerunit arround little transformer showed print overheated ,cupperline loose from print.

action : exchange powerunit from loudsp1 to loudsp.2, after this action loudsp 2 works fine , greenlight, music plays clear . after disconnecting source loudsp 2 gos from on to standby and vice versa on a constant base. 

I can hear the relais switching on/off.

Does somebody knows , where to search for the trouble and knows a solution? 

Thanks for a reply

Ueli out of Switzerland