As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COMPLETE LOSS OF THE NR 1 HYDRAULIC SYSTEM IN FLIGHT AT FL410. HYD QTY DROPPED TO 15 PERCENT, PRESSURE FELL TO 100PSI. UPON LANDING HYDRAULIC FLUID NOTED ALL OVER BELLY OF ACFT AND COVERING INSIDE OF "HELLHOLE" COMPLIED WITH NORMAL AND ABNORMAL CHECKLIST PER AFM.