Narrative:

At liftoff from sfo we got an EICAS message 'right engine high stage.' followed operating manual and continued with trip. The procedure called for the bleed and pack for the right side to be turned off. At cruise altitude of FL330, the cabin altitude was above 9000 ft and cabin differential was approximately 6.5. At a point 125 mi west of dfw, we started a climb to FL370. After leveling at FL370, the cabin altitude began to climb until it exceeded 10000 ft and the warning horn and EICAS message 'cabin altitude' appeared. We began a normal descent to bring the cabin altitude below 10000 ft. The cabin altitude was above 10000 ft about 3 mins. At that point we diverted to dfw and landed.

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Original NASA ASRS Text

Title: A B757-200 IN CRUISE AT FL370 DIVERTED DUE TO A SLOW LOSS OF CABIN PRESSURE CAUSED BY THE R ENG HIGH STAGE BLEED VALVE FAILURE.

Narrative: AT LIFTOFF FROM SFO WE GOT AN EICAS MESSAGE 'R ENG HIGH STAGE.' FOLLOWED OPERATING MANUAL AND CONTINUED WITH TRIP. THE PROC CALLED FOR THE BLEED AND PACK FOR THE R SIDE TO BE TURNED OFF. AT CRUISE ALT OF FL330, THE CABIN ALT WAS ABOVE 9000 FT AND CABIN DIFFERENTIAL WAS APPROX 6.5. AT A POINT 125 MI W OF DFW, WE STARTED A CLB TO FL370. AFTER LEVELING AT FL370, THE CABIN ALT BEGAN TO CLB UNTIL IT EXCEEDED 10000 FT AND THE WARNING HORN AND EICAS MESSAGE 'CABIN ALT' APPEARED. WE BEGAN A NORMAL DSCNT TO BRING THE CABIN ALT BELOW 10000 FT. THE CABIN ALT WAS ABOVE 10000 FT ABOUT 3 MINS. AT THAT POINT WE DIVERTED TO DFW AND LANDED.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.