From what I read it sounds like this tranny was bound to bust up, but just to play devil’s advocate…There is one easy solution that should only cost about $35.
It’s called small claims court, if you think that New Era is really responsible for the damage. Now IANAL, nor am I a mechanic but if you really think you can compel a judge you will win the money for the tranny and NE will be forced to pay. However since you couldn’t convince this jury…suck it up as a downside to your hobby. Shit happens.