As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT DIVERTED DUE TO NR 1 HYD QUANTITY LOSS. CREW REPORTED INTERMITTENT 1A AND 1B CAUTION MESSAGES WITH ERRATIC PRESSURE INDICATION AND THE NR 1 HYD QTY INDICATION. PRELIMINARY INVESTIGATION BY MAINTENANCE, FOUND THE NR 1 RESERVOIR QTY AT ZERO AND THE RETURN LINE TO NR 1 RESERVOIR LOOSE. TIGHTENED B-NUT HYDRAULIC SYSTEM 1 LEAK CHECK GOOD IAW AMM 29-11-01.