What was found
PASSING THRU FL300 AMBER "HYD VOL LOW A" MESSAGE ILLUMINATED, FOLLOWED BY "HYD PUMP FAIL A" AND HYD PTU FAIL' MESSAGES. HYD QTY SHOWED 0%. APPROPRIATE CHECKLIST COMPLETED. AIRCRAFT LANDED. USING EMERGENCY BRAKES. AFTER LANDING LARGE QTY OF CLEAR HYD FLUID NOTED ON BELLY OF AIRCRAFT. - INSTALLED NEW PTU PRESSURE HOSE & REPLACED HYDRAULIC MANIFOLD UPPER PLUG O-RING. BLED / SERVICED 'A' SYSTEM HYDRAULICS IAW CE 750 MM 12-10-15. OPERATIONAL & LEAK CHECKS GOOD.