What was found
CAPTAIN REPORTED BOTH AIR CONDITION PACKS WITH LOW FLOW AND DURING DESCENT IT WAS NECESSARY TO MAINTAIN THRUST. BOTH A/A PILOT AND PNEUMATIC REGULATORS WERE REPLACED IAW MM 21-20-00, TESTS WERE PERFORMED BUT PRESSURIZATION PROBLEMS CONTINUED. DURING TESTS, LEAKS WERE DETECTED AND CORRECTED, FLOW CONTROL VALVES AND LEFT WATER SEPARATOR TEMPERATURE CONTROL VALVE WERE REPLACED IAW MM 21-31-1, 21-31-11, 21-20-03 AND 36-10-02 AND FORWARD CARGO COMPARTMENT DOOR SEAL WAS REPLACED. CABIN PRESSURE CONTROL AND FUNCTIONAL TESTS TO BOTH AIR-CONDITIONING AND FUSELAGE LEAKAGE TEST WERE PERFORMED IAW MM 21-32-00 AND 36-10-00, ALL CORRECT.