smeg DWI612 ?

was displaying ERROR CODE E8.removed motorized selector box (top/bottom spray arms)near distribution pump.removed broken glass from inside sealed box.reassemble.tested ok until it stopped mid cycle again with the same code.repeat all again but all ok.tried outside motor ok cogs ok micro switch ok.leaver on micro switch feels weak.could it be that the leaver fails while in motion or could it be something else.any sugestion will be welcomed.thanx