Ok, just in case some of you want to know a resolution to this problem.
1. water pressure was low static was 44 psi and dropped to less than 24 psi with fill valve open. customer had a pressure reducing device on and I ended up adjusting it higher. (if you added 12 oz of water manuall noise went away)
2. water level fine now, but noise continued even louder , still a dry sump and water level good.
3. d/w was tilted a little forward (top of d/w out) I remounted and leveled (not much 1/4 inch)
4 Wa La......noise gone, no more dry sump noise
I never would have expected a result as leveling that little could have made a big difference.
recap replaced fill valve no good disassembled and cleaned pump no good check all wash arms no good increased water pressure (an option most do not have avail) no good tilt d/w 1/4 backward and problem gone