The battery caddy on the system board was decrepit. Many restorers move the backup batteries of of the board to protect it from battery acid. This is wise and I did the same. It required removing the old holder and installing a jumper wire, then putting a Radio Shack battery holder on the back box.
November 2009 archive
One thing I did that a purist might not agree with, I replaced almost every incandescent bulb with a new LED. In my view the benefits far outweigh the ever-so-slightly-reduced authenticity. Benefits of LEDs: Bolder and more vivid colors Longer life Cooler burning Draw less power and therefore easier on the wiring and components …