I have often wanted to swap out the pups in my Carvin. I have active electronics and a piezo in the bridge as well. Honestly i am just lazy. But here from the Carvin site is a link to a PDF manual, which you may already have and may not help.>>>http://www.carvinservice.com/crg/manuals/pickup_wiring-rev2008.pdf
. .>carvin manuals page<
I have had the guitar new since 2002. I love it. I like the neck pickup and would not swap it. But i would not mind swapping the bridge pup out. It is not a bad pup i dont hate it, just not a big fan.
Also I dont wanna mess up the actives or piezo. That is a concern. And i have not done any pickup swaps in the last 15 plus years. I may be a bit nervous. So i wait until i have a break from work and family and use the bridge pup. On the back burner you could say.
Good luck. Lemme know how it goes.