As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXPERIENCED RAPID CABIN DEPRESSURIZATION AT FL430 CABIN ALTITUDE INCREASED AT 10,000+ FEET PER MINUTE. EXECUTED EMERGENCY DESCENT TO 15,000 FT IN LESS THAN 4 MINUTES. AFTER LEVELING AT 15,000 FT CABIN PRESSURE SYSTEM APPEARED TO RETURN TO NORMAL OPERATION AND ALTITUDE SCHEDULE. REPLACED LT AND RT SAFETY VALVES AND SWAPPED IASC NR 1 AND NR 2. OPS CHECK GOOD FOR IASC SWAP AND FOR THE OUTFLOW VALVE.