It is likely your pickups and wiring were all replaced by the previous owner. PRS would never leave the pickup conductors that long, or at least un-tied.
If you end up doing the work yourself, refer to Lindy Fralin's website for ample, sound advice for proper wiring. I just rewired a Private Stock Santana. I was surprised how little room there is in that tone triangle, but I was able to fit what I wanted.
It looks like a mess but it sounds great and is super quiet. I used that solid blue cloth wire to relocate the ground buss. I also zip-tied the tone cap to an underlying wire to protect the leads before buttoning it all up.