First, thank you all for the replies. I try never to undervalue information!
Since the LCD (only) displays appear "dim" all the way across, could there be a "problem" with the dimmer (or some connection at the switch)? I have the dimmer turned up to max, and the "other" lights respond.
And: how would I gain access to the bulbs or the dimmer (my guess is that it's part of the cluster)? Is the cluster easily removable?
I appreciate all this advice - sometimes it takes awhile to make friends with a "new" marque.