The Parker Hannifin case was the one that PH had to lose in order to appease an important Boeing customer - SQ. PH planned to mount an agressive appeal to the finding but, to the extreme surprise of PH's attorneys, the appeal was dropped. Blame politics at the time but PH's attorneys certainly wanted to proceed.
One of the plaintiff's attorneys in the PH court case appeared in the Nat Geo documentary on MI 185. He lost considerable credibility when he referred to the B737 fuel dump system. It doesn't have one.
The crash of MI 185 was not caused by any system or component malfunction, rudder or otherwise. A "human" component was solely responsible - and I use the word "human" with much hesitation.