I have to ask if you have check the basic items first?
Zero'd out the HPR and raised the pressure slowly until it is cycling, does it still leak?
I assume your 100% sure it is coming from the noid? there are certain other areas that can leak that can sound like it is coming from the noid.
Then check the link posted above.
"The Harder the World, The Fiercer the Honor."
- The BEST way to send greeting cards!