What was found
HYD 3 ELEVATOR OFF LEVEL 1 MESSAGE OCCURED SHORTLY AFTER TAKEOFF, NOTICED HYDRAULIC FLUID IN NR 3 DECREASING RAPIDLY FROM 7.8 GAL TO 2.5 GAL IN APPROX 5 MIN. EMERGENCY DECLARED. FOUND PRIMARY STAB TRIM CTRL MODULE (UPPER) LEAK AT CRACK ON MODULE BODY, DEACTIVATED PRIMARY TRIM CONROL VALVE, IAW MM 27-43-40-000-801, STARTED REMOVAL OF PRI-TRIM CONTROL VALVE IAW MM 27-43-40-000-801 UP TO STEP 1A) (1A) .