What was found
FL 340 SCHEDULE CABIN 5200 FEET CABIN UNCONTROLLED CLIMB TO 126500 FEET. REMOVED AND REPLACED TEMP CNTL BOX IAW MM 21-55-091-5, CONTROL BOX AND THE 35 DEGREE CONTROL VALVE OPS CHECK NORMAL. REPLACED LEFT FLOW CONTROL MODULATING AND SHUTOFF VALVE REF M/M 36-12-061, OPS CKS GOOD. PERFORMED HIGH PRESSURE BLEED CONTROL CHECK PER JRH CHAPTER 8. OPS CKS GOOD. ALSO, PERFORMED PRESSURIZATION CONTROL SYSTEM TEST REF 21-31-000. ALL CHECKS GOOD, OK FOR SERVICE.