I recently bought 2001 MIM jazz bass in pretty good shape. Except both volume pots are unresponsive until you turn them up to 7 or 8 and then there is a volume increase. Odd that its both pots. Given this is my first jazz bass I am wondering if that's just the way it is. Alas google searches and forum searches have not answered my questions. Before start swapping out parts can I get some guidance , search hints or thoughts ? Is there a thread(s) for me to go through ? Tone pot is great on this guitar.