What was found
GOT CABIN PRESSURE WARNING AT ALTITUDE, FOLLOWED BY CABIN AUTO 2 CAUTION. SWITCHED TO AUTO 1 AND GOT CABIN AUTO 1 CAUTION. AT 10K THE CABIN RECOVERED AND BOTH CABIN AUTO 1 & 2 EXTINGUISHED. AIRFLOW IS WEAK ON THE GROUND AND IN THE AIR. REMOVED AND REPLACED BROKEN DUCT IAW AMM21-51-07-4 AND COMPLETED EXCESSIVE CABIN PRESSURE LEAKAGE TEST PER REF AMM 05-51-24-2. LEAK TEST WAS SUCCESSFUL. A/C OK FOR SERVICE.