As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NO EMERGENCY DECLARED. FLIGHT RETURNED TO DEPARTURE DUE TO UNABLE TO PRESSURIZE THE CABIN. WHILE CLIMBING TO 10,000, CABIN ALTITUDE WARNING INDICATION AND LEAK SOUND FROM THE L1 AND L2 DOORS. LANDING UNEVENTFUL. PERFORMED A BITE CHECK OF BOTH PRESSURE CONTROLLERS IAW AMM 21-31-00 AND PRESSURIZATION GROUND TEST IAW AMM 21-21-00. OPERATIONAL CHECKED GOOD.