Posted for Steve Rosenzweig <rosenzweig2@verizon.net>:

 Scott,
 fantastic job at identifying this for me.  While the switch looks different
from the picture below, I'm positive that's what it is now.  I actually
disconnected the pitot and static lines from it and flew the plane.  The
result was that the gear would not retract. I'll have to still determine if
the leak is internal to the switch or at the connection. But that will be
easy!
 thanks for the help.
 
 Steve Rosenzweig
 Lancaster CA
 LNC360 N171DK