We had the same issue, we had done x-ray and totally remember sections J, K and L being worked by Radiologist.
But Immi NZ complained that it was not sent through to them, we went back to medical centre with Immi NZ letter and explained them that these were missing, at first they were not willing to admit , later senior person from the medical centre agreed to re package and hand over the sealed one to us to re-send to Immi NZ ourselves (win-win for both of us) and problem sorted out.
This generally happens on medical centres which process very low volume of visa medicals - Radiology dept is different and separate and they miss out the forms if the final person who seals them does not check all of the details have been collected and packaged.
EOI Submitted JUL 2008,EOI Selected AUG 2008
EOI Approved NOV 2008,ITA Issued JAN 2009
Application Submitted APR 2009,Visa Interview AUG 2010,Approved DEC 2010.
AUCKLAND FEB 2011