Good evening,
I have also a working North American MX 5000 (used in a bedroom) and I did replace many capacitors in it about 10 years ago. I have written a repair guide and it should be on the service manual repository on Beoworld.
Basically, the job is to replace all capacitors branded Rubycon (many black and one blue) as they leak and stop working. If your set is still working, perhaps it has been serviced before or came from a batch where Rubycon caps where not used.
The only MX series TVs released in North America by B&O were the 5000 and 5500. After that, there was a gap of about 7 years where B&O didn't have any TVs available for that market.
This is slightly off-topic, but if you operate your MX 5000 with a Beolink 1000, always periodically check if the batteries are not leaking inside the remote even if it is still working. I had to dismantle and clean my remote this week because of this.
Good luck,
Jean