Problem solved – an old man living in a cave full of ancient technology hidden away from the world occasionaly shares his wisdom in all things B&O with us mere mortals before he vanishes again for decades, and I was at the right place at the right time.
So here we go: The internals are accessed via the front of the TV – at least in the case of a 10-46, in order to gain access, remove the screws at the bottom, then flip over and gently slide off aluminium frame and glass, and you’re in. Have fun.