As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN DECOMPRESS AT 33K. CABIN CLIMBED TO 11K & WOULD NOT DESCEND. EICAS MSG CABIN ALTITUDE. ACFT WAS DESCENDED BELOW 10K IAW QRH & CABIN PRESS FOLLOWED DESCENT. PERFORMED SEVERAL TASKS INCLUDING AMM 5-51-98 CABIN PRESSURIZATION INSPECTIONS. SEE AMIS HISTORY FOR DETAIL SIGN OFFS & REPAIR.