What was found
INSPECTION TYPE:N/A**SUPPLEMENTAL SDR* DECLD EMERG/UNDECLD EMERG*A/C LANDED W/O INCIDENT* WHILE @ FLT LVL 280 SINGLE PACK OPERATION GOT CABIN ALT EICAS & WARNING. RAN QRH PROCEDURE & COULD NOT GET CONTROL OF PRESSURIZATION. EXECUTED EMERG DECSENT 10000 FT LIGHT & WARNING WENT OUT. DFRD PER MEL 21-31-1A. PLACARD INSTALLED. (CABIN PRESSURE CONTROL SYS 1).REPLACED RH PACK FLOW CONTROL PER AMM 21-51-01-201. OPS/LK GOOD AT THIS TIME. THIS CLEARS M762640. PLACARD REMOVED ESR IPC 21-51-11-01.