As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FLIGHT LEVEL 430, THE EMERGENCY PRESSURIZATION ANNUNCIATOR ILLUMINATED & PRESSURIZATION RATE SURGED, FOLLOWED BY CABIN ALTITUDE WARNING ANNUNCIATOR LIGHT ON. CABIN ALTITUDE REACHED APPROX 11500 FT. AN EMERGENCY DECENT WAS EXECUTED. CABIN ALTITUDE ANNUNCIATOR EXTINGUISHED AT ABOUT 16000 FT & SYS FUNCTIONED NORMAL. REPLACED ACM OVERTEMP SWITCH IAW MM 21-30-01. LEAK & OPS CHECKED GOOD.