As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THRU FL 240 RECEIVED CABIN ALT CAUTION FOLLOWED BY CABIN ALT WARNING MESSAGES. CABIN ALT REACHED 10,800 DELTA P WAS NOT NOTED. INITIATED EMERGENCY DESCENT TO 10,000 MSGS EXTINGUISHED. ACFT RETURNED TO DEPARTURE AFTER T/O -- EMERGENCY DECLARED. R & R CABIN PRESSURE SELECTOR PANEL IAW AMM 21-31-10. OPS CHECK GOOD.