i play a carvin LB75F and i have noticed that it has developed quite a bow right around were the 7th fret starts (if you look from the body of the bass up towards the headstock). it goes upwards. i am probably not saying this right. but i think its messing up my sound. i dont think its the action, i have adjusted that and its high on the last fret but basicaly on the fretboard at the first couple frets. anyway, if you think i should get my truss rod adjusted do you think i should try this myself or have my local music store do it for me? i have a book that says how to do it, i have just not had to do this before.