http://www.spaceflightnow.com/shuttl...4/050723count/

Engineers said earlier this week that even subtle grounding
problems could result in electromagnetic interference that
might affect the signals to and from the ECO sensors. But
again, engineers were not able to duplicate the failure
signature and the problem remains an unexplained anomaly.
...
If a problem shows up during fueling with sensor No. 4, engineers
will have high confidence the problem is somewhere in the wiring
between the point sensor box and the sensor itself, and not a
generic problem that could affect the other three sensors.

I have some difficulties to understand the logic of the last sentence.
As the failure went up only in cryo cold conditions it could well
be due to thermal contraction of some parts somewhere. Thats more
or less a mechanical problem affecting the electrical system of
at least one sensor system now. But if the Shuttle launches the
extraordinary vibrations could well have a similar effect like the
thermal contraction. It could affect the other 3 sensor systems
wiring/grounding even more than the thermal contraction of the one
system we know from. So I see no evidence that the problem is
not generic to the whole fleet now.


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