As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN ALT CAUTION FOLLOWED BY CABIN ALT MASTER WARNING. COULD NOT CONTROL IN MANUAL. INSPECTED AND FOUND LAV SERVICE PANEL OPEN, DUMP HANDLE LOCKED OUT AND SERVICE VALVE OPEN. CLOSED ALL PORTS. PERFORMED OPS CHECK OF CABIN PRESSURIZATION OF ACFT & FOUND NO DEFECTS. OPS CHECK IAW AMM 21-31-00.