Got a little MPV (1996) glitch. The instrument panel lights have stopped working. That is, I can't read the instruments at all at night. The thumbwheel adjustment makes no difference at all.

At the same time (and I can't believe it's a coincidence) the headlights-on warning beep has also stopped working. I've checked all the fuses that it would seem to make sense to check and they're all okay. Other warning signals still work, as do the warning lights on the dashboard/instrument panel. Anybody have any suggestions where else to look or what to do, before I go back to the workshop?

Ed, Perth, Australia.