737 rudder problems of the past

Dan Luke writes:

Yet, AFAIK, no smoking gun for the supposed rudder hard-over crashes was ever
found. The retrofits were a based on a best guess, right?

Yes, but it was a very likely guess, as the parts that were involved
were consistently isolated to be the same. I think the only remaining
mystery was the original cause, but by modifying things presumably
whatever the original cause was would not have the same effect again.

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