As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRESSURIZATION CONTROL AUTO INOPERATIVE LIGHT ILLUMINATED. OPERATION IN MANUAL MODE WAS OK. EMERGENCY DECLARED. FOLLOWED FIM 21-31-00-815-803. REMOVED AND REPLACED THE NR 2 AUTOMATIC PRESSURE CONTROLLER, OPS CHECKED GOOD IAW AMM 21-31-02.