What was found
AIRCRAFT WAS GROUNDED: HYD SYSTEM B FALED UPON STOPPING AIRCRAFT. COMPLETE LOSS OF HYDRAULIC FLUID. DECESION MADE TO RETURN TO PHX. EMERGENCY DECLARED AND AIRCRAFT LANDED OVERWEIGHT WITHOUT INCIDENT. AIRCRAFT WAS TOWED TO GATE. TROUBLE SHOOTING REVEALED R/H MLG RETRACT / EXTENSION ACTUATOR PRESS LINE RUPTURED. MAINTENANCE REPLACED R/H MLG EXT/RET ACTUATOR PRESSURE AND RETURN LINES PER AMM 32-32-11. REPLENISHED A & B HYD SYS'S 12GALLONS OF SKYDROL. CHECKED AND CYCLED FLIGHT CONTROLS INCLUDING FLAPS AND T/R'S AND ACTUATED LANDING GEAR FOR BLEED OUT OF SYSTEMS. LEAK CHECK'S GOOD.