What was found
AFTER TAKEOFF OF FLIGHT 2753, CREW GOT A HYDRAULIC MASTER CAUTION LIGHT AND NOTED HYDRAULIC QUANTITY WAS AT ZERO. EMERGENCY DECLARED, WAS AT 300 PSI. MAIN WAS A ZERO I/B AND O/B WAS AT 300 PSI. MAINTENANCE FOUND RT MAIN LANDING GEAR DRAG BRACK HYDRAULIC SWIVEL LEAKING. REMOVED AND REPLACED, OPS CHECKED. ALL CHECKS GOOD.