What was found
AIRCRAFT WAS GROUNDED: PILOT DECLARED EMERGENCY ON ACCOUNT OF PRESSURIZATION ISSUE. ON TAKEOFF/CLIMB OUT ALL COCKPIT AIRFLOW STOPPED. TEMP TO 83 DEGREES F AND RISING. SHORTLY AFTER COCKPIT AIRFLOW WENT FULL, EARS POPPED AND SUPPLY TEMPS DROPPED TO 14-16 DEGREES. CABIN TEMPS HOT IN FWD, COLD IN AFT. MAINTENANCE REPLACED ENG 1 HP BLEED VALVE AND PRESSURE REGULATING VALVE, OPS CHECK GOOD. PERFORMED BITE TEST IAW AMM 36-11-00-740-001-A, OPS CHECK GOOD, NO FAULTS FOUND.