What was found
DIVERSION/DECLARED EMERGENCY. PRESSURIZATION BECAME UNCONTROLLABLE APPROX 30 MINUTES INTO FLIGHT AT FL 330. HORN SOUNDED, WITH CABIN ALTITUDE INDICATING 10K, IMMEDIATELY DESCENDED, QRH COMPLETED. REMOVED AND REPLACED LEFT 35 DEGREE VALVE, FUSELAGE DRAIN, AND LT AND RT WATER SEPARATOR BAGS PER MM.