Found it!

The vinyl tubing is 8+ years old, and leaking at both ends of the flask
tube. The fit looked only slightly less than tight. The tube was not hard as
a rock but firmer than new tubing. The S-Nav and Winter are paralllel, not
series. Cutting off the vario end of the tube reduced, but did not eliminate
the leak. Then cutting off the flask end eliminated the rest of the leak.
Testing the vario alone proved it was leak free.

Thanks UH.
-
Hartley Falbaum
"KF"

wrote in message
oups.com...
Cause is leak on the capacitiy side of the vario.
If you have the varios in series, the likely cause will bea leak on the
sensor board of the Cambridge.
Otherwise, just replace the tubing between the capacity and the Winter-
it's probably hard as a rock.
Good Luck
UH