The first ND was when I initially filed my 485 in dec 2004 (I-485 Filed ND:01/20/2005 ).
Then on 03/07 I got a mail from USCIS stating that they moved my case from VSC to TSC.
(I-485 Filed ND:03/07/20070) They issued a new ND for the same.
The NOID is for incomplete I693 medical form (without TB skin test).I then sent a new 693 form.
Check the signature for the NOID dates and followup with LUDs.
kohinoor4me,
You case is similar to mine. Hopefully you will be gettign some good news soon.