As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH FL 250, RECEIVED CABIN ALTITUDE CAUTION MESSAGE FOLLOWED IMMEDIATELY BY CABIN ALTITUDE WARNING. INITIATED TO FL 100 PERFORMED ALL APPROPRIATE CHECKLIST. DECLARED EMERGENCY AND LANDED. TROUBLESHOT SYS TO PRIMARY OUTFLOW VALVE BLEEDING AIR WHEEL CLOSED. PRIMARY OUTFLOW VALVE FOUND TO BE SERVICEABLE. ROOT CAUSE: CARGO DOOR SEAL.