As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERSION DUE TO ACFT FAILED TO PRESSURIZE IN FLIGHT WITH PACKS ON & AUTO BLEEDS ON. ASSOCIATED CABIN ALT WARNING AT APPROX 12000 FT, USED MANUAL TO CLOSE OUTFLOW VLV FROM FULL OPEN POSITION TO PRESSURIZE ACFT. EMER DECLARED WITH ATC. ACCOMPLISHED DCPC BITE PROCEDURE IAW FIM 21-31-00-810-801, SYS GOOD. ACCOMPLISHED CABIN PRESS LEAK CHECK TEST IAW AMM 05- 51-91-790-801, CHECKED GOOD.