Need help finding replacement "sub" for Sony SRS-x88

Ive had this guy for YEARS and finally the active sub is making noises. I've been trying to find parts for it without much luck

https://preview.redd.it/065lvpqwfw5g1.png?width=489&format=png&auto=webp&s=7a7679442efcc1c1334479a77a343b762c151db4