Hi
Correction needed here, I guess I was thinking about the tuning globes. The globes in the volume indication setup are the larger item, 6v and 1 watt. The smaller globe was for the tuning indicator. I have just had a quick look at the BM6000 internals to refresh my memory and yes, it is fairly easy to replace these as follows:
Slide out the centre strip under the display
Remove the glass panel by lifting at the front and pulling forward
Split the casing by undoing two screws and opening up
Release the six or seven black clips on the back of the PCB that hold the facia panel
Ease out the volume slider and take the facia panel off.
This gives good access to both globes
Have fun
Regards
Geoff