What was found
ENROUTE, CENTER HYD QTY EICAS & LIGHT ILLUM IN CRUISE. STATUS PAGE SHOWED 0 QTY & MAGENTA RF WITH 3000 PSI. DIVERTED, EMER DECLARED. LANDED WITHOUT INCIDENT. ACFT GROUNDED. CENTER HYD IND DEFERRED IAW MEL 29-33-02-01. HYD IND INOP. ACFT RELEASED TO SERVICE. IAW FIM 29-11 FAULT TREE 820 ACCOMP GVI OF HYD QTY XMITTER. REMOVED CONNECTOR & VERIFIED NO PINS BACKED OUT IAW AMM 29-33-02. RERACKED QTY MONTIOR IAW AMM 29-33-01. CREW DEBRIEFED, NO DEFECTS DURING ALL PHASES OF FLT. WIRE SHAKEDOWN & IND MONITOR UNABLE TO RECREATE FAULT IAW AMM 29-33-11. PULLED C/B 11L20. RESET C/B, DISCONNECT CONNECTOR AT D556, EICAS READS 0.00RF. RECONNECTED. R & R CENTER HYD QTY XMITTER IAW AMM 29-33-02. OPS CHECKED GOOD.