As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERTED DUE TO LOSS OF PRESSURIZATION AT FL430. CREW EXECUTED EMERGENCY CHECKLIST PROCEDURES AND DESCENDED. AFTER DESCENT PRESSURIZATION NORMALIZED. REMOVED AND REPLACED ECS MUFFLER AND PRESSURIZATION CONTROLLER. LEAK AND OPS CHECKED GOOD.