Good point...but it also depends on which report you're talking about...
NEASC seems to be a private member organization, so that's probably why their reports (and warning letters) are not public:
http://www.neasc.org/about_us/mission/
Several articles have mentioned this, and I think it is worth understanding: at present, NAHS is accredited and remains so (as stated on the NEASC website). Warning status, as I understand it, means there are current problem areas, which could possibly place accreditation status in jeopardy if not corrected (but the timetable is not made clear to us).
The AYP and MCAS reports are handled by the Mass DOE, so those reports are public, and available online. However -- the reports for 2008 MCAS aren't available until October (so the reports online right now are for 2007 MCAS scores).