Looks like the Subaru Gods impose their wrath upon you…oogggly goooggly.
won’t your “mods” void the drive line warranty? When I decided to go with my mods I gave up my warranty. I know you only have a pipe and tune, but they are mods I assume would void a drive line.
I have a suggestion though!
How subjective is “abuse” in a transmission???
Can you sit down with a tech and manager and write up a little list of signs of “abuse” BEFORE they work on it. I’m not mechanic, but i’m sure that they are looking for certain signs…that will at least narrow them down and not let them make shit up after your ride is in pieces. I went in about some strange noises in my tranny, they told me the same thing and it scared me off! I just turn up the radio 
…not really.
Good luck bro.