Thanks mate - After making sure the board was flat, I did give the high ones a tap with the mallet before taking the leveling block to it. I used a 600mm steel rule as a straight edge and the rocker to find the main offenders. I've re-crowned and polished them with 400, 600 then 0000 steel wool now so will need to give it a play check check once the neck can go back on the body.