What was found
ON TAKEOFF, PRESSURIZATION FLOW LIGHT ILLUMINATED, CAUSING INABILITY TO PRESSURIZE AIRCRAFT. AN EMERGENCY WAS DELCARED AND RETURNED TO DEPARTURE, LANDED WITHOUT INCIDENT. AIRCRAFT WAS GROUNDED. NO FAULTS NOTED ON BOTH PRESSURE CONTROLLERS. DECAY CHECKED GOOD IAW AMM 21-00-00. SEVERAL DUCT LEAKS WERE REPAIRED.