What was found
UNABLE TO CONTROL PRESSURIZATION ABOVE AT 12,300 CABIN GOT UP TO 8500 WITH APPROXIMATELY 4 TO 5 DIFFERENTIAL PRESSURE WITH EVERYTHING CLOSED. REPAIRED L-1 DOOR SEAL LOWER MIDDLE PER MM 52-00-1, 52-11-71. FOUND EQUIP COOL FLOW CONTROL VALVE DEFECTIVE PRESSURIZED WITH VALVE LOCKED CLOSED ABLE TO GAIN 8.0 DIFF. PSI REMOVED AND REPLACED EQUIPMENT COOL FLOW CONTROL VALVE IAW MM 21-58-21. PRESSURIZATION CHECK NORMAL PER MM 21-30-0.