What was found
LEFT 10TH STAGE BLEED AIR STUCK CLOSED.FO NOTICED NO AIR FLOW DURING SINGLE PACK OPERATIONS AT APPROXIMATELY 7000€™ PRIOR TO ANY EICAS MESSAGES.APPLIED CABIN ALT QRH WITH NEGATIVE RESULTS. THIS DISCREPANCY WAS TRANSFERRED TO CAMP ITEM 29385840 WITH THE FOLLOWING CORRECTIVE ACTION: "SEE CP 29387828 FOR REMOVAL AND REPLACEMENT OF THE LH 10TH STAGE BLEED AIR SHUTOFF VALVE. PERFORMED OPERATIONAL AND LEAK CHECKS OF THE LH 10TH STAGE BLEED VALVE IN REFERENCE TO AMM 36-11-00. OPS AND LEAK CHECKS GOOD AT THIS TIME. "