As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CRUISE FLIGHT CREW DECLARED EMERGENCY WITH INDICATION OF RAPID DEPRESSURIZATION. FLIGHT DESCENDED TO 3000 FT AND LANDED SAFELY. MAINTENANCE R & R RELAY K0187 FOR A PACK 1 VALVE FAIL AND PERFORMED AN OPS TEST OF PRESSURIZATION SYS WITH RESULTS GOOD. ACFT WAS APPROVED FOR RETURN TO SERVICE.