Hey Talkbass! I recently acquired a used Carvin PB5 from Ebay with a single coil J pickup in the bridge position and all passive V-V-T electronics. I really like this bass so far, except for this one weird issue with the electronics. For some reason, the split coil P pickup is humming like a single coil when used on its own. This hum sounds the same as the hum that comes from the soloed single coil pickup. However, the bass is hum cancelling with both pickups engaged. This is upsetting, because 90% of the time I only want to use the P pickup, which is supposed to be hum cancelling on its own. At first I thought it might have been due to poor shielding, since the bass was producing lot of noise unless I touched the strings/bridge with my hand, regardless of the pickup configuration, so I went in and applied a bunch of copper tape to the electronics cavity. This has resolved that particular issue, and the bass is now dead quite with both pickups on, but the mystery hum from the split coil pickup remains. Basically, I'm stumped. Would it be possible to have this issue repaired, and if so, about how much would that cost me? If it's more than $100 or so, I think I might be better off just getting a new set of pickups.