As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CABIN PRESSURE WARNING LIGHT CAME ON AT FL230 FOLLOWED CHECKLIST, CANNOT CONTROL THE CABIN IN MANUAL MODE. FOUND HOT RE-HEATER INLET DUCT DAMAGED. REPLACED HOT RE-HEATER DUCT REF AMM TASKS 21-51-66-000-809, 21-51-66-400-809. PERFORMED FUNCTIONAL TEST OF PRESSURIZATION CONTROL IAW AMM TASK AMM TASK 21-31-720-801. CHECKS GOOD. CLEARS DMI 543592. RETURNED TO SERVICE.