As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW WAS STARTING CRUISE WHEN THEY LOST PRESSURIZATION, DECLARED EMERGENCY AND DID EMERGENCY DESCENT FROM 17000FT TO 10000FT FLIGHT WAS ENROUTE FROM ANI TO ANC, FLIGHT CONTINUED TO ANC WITHOUT ANY DIFFICULTY. MX FOUND THAT MASS FLOW VALVE BAD, PART WAS REPLACED AND PRESSURIZATION CHECK WAS NORMAL.