Too vague a description but a quick guess of the lower end of serious is can you check if you’re upper tweets are preforming?

obtain some frequency test tracks (L&R) if you can find and see if all tones come through correctly. 

I lost an upper tweeter once and  (don’t think I heard it pop but) but on replacement I quickly acsertained the second upper was not performing as well as or equally as the replacement. I would uly alwayes recommend replacing them as a pair

if the tones are correct, it’s internal electronics. If not, replace faulty drivers

I have requested a service guy. The chassis was replaced one year ago, and it's most likely the issue.

Once again..a new chassis (all electronic was replaced)

Once again..a new chassis (all electronic was replaced)

Hello,

How much did it cost for the chassis replacement ? (MK1, MK2 or later version ?)

Thanks

That’s something I’d like to know as well

That’s something I’d like to know as well

That’s something I’d like to know as well.

In the neighbourhood of €1,000.00. 

It must be repaired by an authorised B&O service guy. When it has been repaired it will be configured as it was originally.