That does not jive with what I recall of the problem. My recollection is that Boeing simply did not build it into the system. You couldn't get one with a redundant sensor in it. They were all built with one sensor.
Nope. The extra sensor was part of an options package. When ti should have been standard and required for obvious reasons. And that is just the tip of iceberg on the stupidity Boeing design on that aircraft. I believe that one of the design flaws still exists. The “STAB” switch does not have a position to cancel all computer control and still have Electric control from the yoke.