Originally Posted by
OPNLguy
Data eventually showed that a rudder hardover was possible in a certain airspeed range, and a similar Ops Manual bulletin and AD went out mandating corrective speeds until rudder PCUs could be re-designed and installed.
Beat me to it- and also, IIRC WN is/was the largest (domestic?) 737 operator at the time before the root cause was determined, and never had an incident related to the hardovers.
(Also wouldn't surprise me to find out that WN's pilots are better trained and more-experienced than those of a third-world country.)