B767 ACFT HAD HYD LEAK; BUT MAINT WAS UNABLE TO FIND SOURCE. SUSPECTING THE LEAK WAS FROM LNDG GEAR SEAL WHICH RESEALED; ACFT WAS DISPATCHED FOR OVERWATER FLT. ENRTE HYDS LEAKED SLOWLY; BUT NOT ENOUGH TO DIVERT.

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ACFT HAD RPTED CTR SYS HYD LEAK AT FRA. MAINT UNABLE TO FIND SOURCE OF LEAK AND SUSPECTED A SEAL IN THE R LNDG GEAR HAD COLD SOAKED AND LATER RESEALED ITSELF AT WARMER TEMP. ACFT WAS SVCED AND DEPARTED AT APPROX 390000 LBS. AFTER ABOUT 90 MINS OF FLT; ALL 3 HYD SYS QUANTITIES HAD DECREASED SLIGHTLY. #1 SYS QUANTITY REMAINED THE SAME FOR BAL OF FLT. #2 AND #3 SYS CONTINUED TO SLOWLY DECREASE. WX WAS GOOD AT KEF SFJ YFB YYR YUL YYZ AND ORD. BASED ON TIMED VERY SLOW FLUID LOSS RATE FLT CONTINUED TO ORD. ACFT DOES NOT HAVE A FUEL DUMP SYS. A HVY OVERWT 20 DEG FLAP LNDG IN EVENT OF CTR SYS FAILURE WAS CONSIDERED. FLT LANDED AT ORD WITH 3 NORMAL HYD SYS. CTR SYS QUANTITY WAS ABOVE REFILL TICK. R SYS WAS BELOW REFILL TICK. THE LNDG WAS PLANNED FOR POSSIBLE CTR SYS FAILURE WHEN THE GEAR WAS LOWERED AND FOR POSSIBLE R SYS FAILURE IF THERE WAS A BRAKE PROB. AS THE BRAKES WERE PARKED AT THE GATE THE R SYS WENT TO ZERO. THE FO AND INTL OFFICER PERFORMANCE WAS OUTSTANDING AS WE CONSIDERED ALL POSSIBLE OPTIONS. THE DECISIONS WERE MINE.