As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROXIMATELY 30 MINUTES AFTER TOP OF CLIMB, CRUSING AT FLIGHT LEVEL 34,000, EICAS MESSAGE "HYD QTY LOW 1" QUANTITY OBSERVED DECREASING REPIDLY ON HYD SYNOPTIC PAGE. SHORTLY AFTER, QUANTITY AT 0.00. EICAS "HYD PRESS SYS 1". NON NORMAL CHECKLIST ACTIONED. - REPAIRED HYDRAULIC TUBE IN NUMBER 1 ENGINE PYLON.