As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REFERENCE LOG PAGE 472314. CREW MADE AN AIR TURN BACK TO DEN DUE TO AN INDICATION FOR THE GREEN HYDRAULIC RESERVOIR LEVEL LOW. MAINTENANCE INSPECTED AND FOUND A GREEN HYDRAULIC SYSTEM PRESSURE PIPE WITH CHAFING DAMAGE AND A PIN HOLE. MAINTENANCE REMOVED AND REPLACED THE HYDRAULIC PRESSURE LINE IAW AMM 29-11-49 PB 401 AND PERFORMED SATISFACTORY LEAK CHECK.