What was found
EXCESSIVE PRESSURE AND NOISE FROM VENTS ON CLIMB OUT AT 10000 DIFFERENTIAL PRESSURE 2 PSI WITH CABIN CLIMB AT ZERO DUCT PRESSURE WAS 40 PSI BUT SAW IT FLUCTUATE TO AS HIGH AS 60 EXCESSIVE NOISE WAS IN THE WHOLE AIRPLANE. PERFORMED AMM 21-00-00 SUPPLY AIR TO COOLING PACK , AMM 21-31-00 PRESSURIZATION SYSTEM GROUND TEST,AMM 05-51-91 CABIN PRESSURE LEAK TEST ,FIM 21-62 TASK 801 ALL TESTS PASS NO DEFECTS NOTED.