Removed the Control Unit completely and powered up the car. The instrument lights go out, BUT the radio still functions! I've unplugged both amps and this had no effect. I'm going to try uplugging the head unit and see what happens. If that does nothing I'll take a run at the headlamp switch, once I figure out how to remove it!

UPDATE: Removed or Unplugged entire Radio Assembly (head unit, amps, cd, tuner). No change, still have draw. Called Becker NA for some advice. Told the Radio Assembly is set up to stay on for 1hr. after ign. is turned off (?!). Either way, I still have the draw of the instrument lamps. I'm inclined to get the Becker looked at for other reasons, but the insturment lamps are driving me nuts! Control Unit is looking more suspicious...

Andy