Have not checked the content yet, but expect it to be OK
After a closer inspection of the mainboard, I found one problem, the collector-coil to transistor J8 is broken completely of the board!!! See picture, yellow arrow and circle where you can clearly see the break-off in the soldering (37 years experience as designer, layout and producer/quality-inspector within SMD-technics!!! I expect an explanation and/or a replace-board without defects!!! For that price I actually did expect an error-free product!!!