Developed an odd problem with mine…
I've done the magnet mod, and for some reason now when I turn the Vol pots off, I still get sound from it. Played it a couple weeks ago at church and when I turned volumes down to 0 I thumped the string as I put it on it's stand and the string definitely produced the sound, not feedback. Had my pedal so I was able to mute it, but not sure what to check. My arthritis has been bothering me really bad lately, so I didn't want to rip it all apart and take the meter and check the electronics. I may take the magnet back out, see if that does anything, Anyone got any ideas.
The only thing I can think of would be to take an ohm meter to the pot and make sure it's really zeroing out, otherwise it may be some bleedthough. If you aren't satisfied with the results of that, I'd ask your question as a new thread over in the Pickups & Electronics forum.
Hope that helps.