Thanks Mark -- I followed those instructions and so far so good -- no buzzer 
and the car starts with no problem...
...
In going through Dan's book, I realized that my problem was more a starting
problem than the buzzer itself (although that was part of it).  In Dan's
book on page 117, he states that you can connect the W/R and the W/O wires
directly together at the module instead of replacing the module.  I believe
that's what I did and my starting problem as well as the buzzer problem went
away.  Apparently, this is what they did in the '75 model.
...
 
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