What was found
DURING THE CLIMB TO FL160 WE NOTICED THE GREEN HYD SYS QITY DECREASING. GREEN HYD SYSTEM CONTINUED TO ZERO ON BOTH ECAM AND OVERHEAD GAUGE. THE BLUE OVER-HEAD HYD SYSTEM QUANTITY INCREASED TO SHOWING OFF SCALE FULL. FOLLOWED ECAM & QRH PROCEDURES INCLUDING MANUAL GEAR EXTENSION. EMERGENCY DECLARED, FOUND BLUE & GREEN CASE DRAIN LINES SWAPPED AT THE PYLON/ HYDRAULIC JUNCTION BOX FROM ENG DRAWING. SWAPPED LINES BACK TO CORRECT POSITION IAW AMM 29-12-69- 04-01. REMOVED AND REINSTALLED BLUE & GREEN CASE DRAIN LINES IAW AMM 29-11-32-04- 01. CHECKED CASE DRAIN DPI'S WERE NOT EXTENDED. PERFORMED DRY MOTOR AND BLED GREEN & BLUE PUMPS NO LEAKS NOTED. ACCOMPLISHED LEAK CHK OF GREEN AND BLUE CASE DRAIN LINES IN PYLON, NO LEAKS NOTED. ACCOMPLISHED GEAR RETRACTION SYS PRESSURIZATION (AIRCRAFT ON GROUND) ITEM NO.7 OF 32-31-00-05 OPS CK GOOD NO FLUID TRANSFER NOTED BETWEEN HYD SYSTEMS. ACCOMPLISHED HIGH POWER RUNS PER MOCC REQUEST. DURING ENGINE RUNS PERFORMED FLIGHT CONTROL CHECKS NO FAULTS NOTED AND RAN PACKS NO SMELL OF HYDRO NOTED. SERVICED HYDS TO CORRECT LEVELS. A/C OK FOR SERVICE.