Not really a visible mod except the pickup looks the tiniest bit different.
But I replaced my bass VI bridge pickup with the Seymour Duncan SJAG-2 that was in my jaguar, and now I love this guitar. FINALLY.
Went downa long road of trying stuff, trying to get into it, realised I would always prefer to play a 4 string to this as a bass in any situation, then I tuned it A-A. That was nearly right and I found it much more fun to play but it never sounded as heavy and good with fuzz as I wanted. So this pickup thing was the last ditch effort and it seriously worked! This pickup is hotter and cuts a lot of bass compared to the stock ones, and it sounds super cool as a baritone guitar rather than the too-bassy weirdly tuned bass thing it was previously. Plus it still has two original pickups if I want to use a bassier sound. But the new bridge pickups cuts SO much better and reacts like I want with fuzz pedals.