B757 FLC HAS PRESSURIZATION DIFFICULTIES.

Narrative

DURING TKOF FROM LGA; THE L ENG HIGH STAGE BLEED LIGHT ILLUMINATED. THE CHKLIST WAS COMPLIED WITH AND MAINT NOTIFIED. JUST S OF CSN VOR IN A GRADUAL DSCNT TO FL310; THE R PACK FAILED. RESET WAS OK AND A DSCNT WAS INITIATED TO A LOWER ALT. PASSING FL280; IT FAILED AGAIN AND AN EMER WAS DECLARED WITH ZDC. THE DSCNT WAS CONTINUED TO 10000 FT. DURING THE DSCNT; THE PACK RESET AGAIN; HOWEVER; A SHORT TIME LATER PRESSURIZATION AUTO #1 AND #2 FAILED. MANUAL OP WAS OK. CABIN EXCEEDED 10000 FT FOR LESS THAN 1 MIN DURING THE DSCNT; AND THUS THE PAX OXYGEN MASKS DID NOT DEPLOY. UPON LEVELOFF AT 10000 FT; WE WERE ABLE TO STABILIZE THE R PACK IN STANDBY MODE. A RADIO CONFERENCE WITH THE DISPATCHER AND MAINT WAS COMPLETED AND WITH THEIR ASSISTANCE; WE WERE ABLE TO RECOVER THE AUTO #2 PRESSURIZATION CONTROLLER. DISCUSSIONS WERE HELD REGARDING A DIVERT TO IAD. HOWEVER; SINCE THE SIT HAD BEEN STABILIZED; WX CONDITIONS WERE EXCELLENT; AND FUEL WAS NOT A FACTOR; THE DECISION WAS REACHED TO CONTINUE. THE EMER WAS TERMINATED AND THE FLT CONTINUED TO DEST NORMALLY.