What was found
HYDRAULIC SYSTEM FAILURE. EMERGENCY WAS DECLARED AND RETURN TO DEPARTURE. FLIGHT ATTENDANTS REPORTED A STRONG ODOR IN THE CABIN. AFTER TAKEOFF, DURING GEAR RETRACTION LOST THE GREEN HYDRAULICS PUMP, RAN APPROXIMATELY 10 MINUTES. AIRCRAFT WAS GROUNDED. REPLACED A BROKEN HYDRAULIC LINE BLOCK ASSEMBLY IN THE MIX BAY IAW 29-10-00. LEAK CHECKED IAW AMM. REPLACED THE GREEN SYSTEM PUMP IAW AMM 29-11-51, CHECKED FILTERS FOR DPI AND CONTAMINATION, NONE NOTED. SYSTEM CHECKED GOOD.