99 legacy l wagon awd tranny seal?

my friends fathers legacy ..auto tranny has a broken seal and will cost $25oo CDN at the dealer to repair..

hes ************ing furious..in his whole life he's never even had to do tranny work on a car before...and hes owned 427 big block camaros

hes trying to find out he thinks there was a call back on that year for tranny problems..im not sure tho

what would cause a tranny seal to go?

i dont know, neither does he, and neither does subaru

its also his wifes car...its never been driven hard or even over the speed limit for 6 years