I had not been playing my CV 60s P for awhile as a solder had come loose. I took it to the shop and had them put in switchcraft jack, CTS pots, orange drop cap while in there. It already has a Fender "Original" pickup and LaBella's on it. I can't say for sure that any of it improved the tone, but it sounds great regardless. What a great bass! I can't stop playing it now.
I play mine every day. They are really that good. Mine is stock except for the T I Flats. I thought about changing the pickup but there isn't anything I dislike about the stock pickup.
Enjoy!!