As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEPARTED WITH #1 HYD SYSTEM 6.0. 1 40 MIN INTO FLIGHT #1 HYD SYSTEM DECREASED 2.8. HYD SYSTEM 2 3 REMAINING STABLE AT #2/6.5. #3/9.7. HYD #1 OFF ILLUMINATED WHEN SYSTEN REACHED 2.5. DECLARED EMERGENCYUNEVENTFUL LANDING DESTINATION KOAK. BLOCK IN HYDRAULICS #1 2.0. #2 6.6 , #3 8.0. ON APPROACH. #1 LOWEST WAS 1.4. FOUND HYD LINE P/N ALK7602-503 LEAKING IN TAIL TANK VENT BOX. REPLACE HYDRAULIC LINE. LEAK CHECK GOOD.