What was found
INSPECTION TYPE:N/A AT APPROX 0100Z CLIMBING OUT OF ABOUT FL340 TO A FILED ALTITUDE OF FL390, THE F/O WAS FLYING & THE AUTOPILOT ENGAGED. CABIN ALTITUDE ALERT ILLUM, ALONG W/AUDIO WARNING. ATC WAS ADVISED THAT THERE WAS A PRESSURIZATION PROBLEM & WOULD HAVE TO DESCEND. PERFORMED ECS BITE PER 36-11-00-5. RAN ENGINES (CREW) BLEEDS OPERATE NORMAL PER AMM 36-11-00-5. GROUND OPS CHECK OK. PERFORMED PRESSURIZATION CONTROL BITE TEST PER AMM 21-31-00-5. GROUND OPS CHECKS OK.