What was found
EMERGENCY DECLARED, C HYD QTY EICAS MESSAGE AND QTY LIGHT ILLUMINATED. HYD QTY ON STATUS PAGE SHOWED 0.4 AT .47 QTY WAS DOWN TO .10 UPON LANDING. ACCOMPLISHED QRH PROCEDURES, LANDED, FLAPS 20 DEGREES IAW QRH/C HYD SYS PRESS CHECK LIST. FOUND LEAK AT C1 HYD PUMP RT W/W AT B-NUT FITTING ON HYD LINE. R & R O-RING ITEM NR 105, PN NAS1612-10, REF IPC 29-11-02-01A. LEAK CHECKED OK. SERVICE CENTER HYD SYS RESERVOIR TP 0.98 ON EICAS. OPS CHECKED REF AMM 29-11-00-715-896, REF - 29-11-02-01A.