I think the electric bass is one the most rugged, maintenance-free instruments out there, but I'd like to hear what others have to say. I'll go first: Broken nut, happened out of the blue on a less than one year old bass, forgot what bass it was, SX? Since then, I do see value in graphite or brass nuts. Scratchy pots on a Sadowsky NYC, 3 yrs old, anti-oxidation spray fixed it right up. Other than that, never had a broken string or had to fix anything in my 17 yrs of playing. In fact, my 13 yr old MIM Jazz 5 which is what I practice on, has slightly darkened marks on the frets, but no identation on the frets at all!