Hi Ian,
replacing the glass door would currently cost you about $170USD. Fixing the problem can be done for the price of an automotive Rear-View Mirror repair kit down at the local auto parts shop, and a hex-head screw driver. That's assuming that the glass has detached 'cleanly' from the pieces holding it onto the hinges; if they're damaged, get the new door.
While I'm thinking about it, contact your local B&O shop, and have them check with national HQ for you...you'll need the serial number from your BS-9000. Early on there was a problem with the doors falling off and B&O issued a global, all inclusive recall covering the replacement of the door assmbly at B&O's expense. Since you have a MK-II it may not apply, but it is worth looking into.
If everything else is working well, then getting the mechanicals looked at falls into the "If it ain't broke, don't fix it" category; but it might be worth asking after the 'N. Music' update. 'Net Music' is B&O's generic term for PC based music servers, BeoPort and BeoMedia specifically. The update would allow your 9000 to access music you have stored digitally. One reason to consider this upgrade is that, at this point none of us really know how the mysterious, looming, BeoSound 5, will fit into the ML system. Obviously it would want to supplant your 9000 as the audio master in the house, but what of the 9000 in a link room?
Russ
We kid because we love.
Bang & Olufsen Tysons Galleria
McLean, VA USA