<p>Update from Nikon USA support:<br>
Sorry, but there is no brightness control for the D1,<br>
NIKON USA SUPPORT.<br>
In reading further I found on page 79 of the original D1 manual a sidebar called "TIPS" almost by accident as the procedure is not described in the operations manual under MONITOR.<br>
When in the "play" mode you can rotate the "sub-control wheel" to increase or decrease the BRIGHTNESS, obviously the tech does not know the operations manual and is issuing bogus opinions. A restaurant is no better than the COOK, in this case Nikon needs to refresh the education of their employees.<br>
Incidentally, the control works fine now.</p>