Well, I looked around for that article on Roger getting arrested over that bass and it's gone. Too bad, 'cuz I found it a fun little Rick factoid. It was on Roger's own website under his 'Writings" heading. I found a reference to the article with a link over in the Rick corporate forum, but the it was from 2005 and the link doesn't work anymore. It was written by Roger and I got such a kick out of it that I sent it to a couple of Deep Purple loving friends of mine. Unfortunately I no longer have a copy.
Roger says on his website that he had the bass modified because he was never happy with it's tone. He wanted a deeper tone. It's too bad he didn't know about bypassing the bass-cut capacitor.
He also mentions on his website that he only has two Ricks; "THE Rick" which is black, and a "red fretless." I'm guessing that the link above to the FG 4001 with the Jazz pickups was either someone making a mistake, or Roger's 4001JG was re-finished in FG for a while.