What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO LAS DUE TO A YELLOW HYDRAULIC SYSTEM RESERVOIR LOW PRESSURE MESSAGE ON DEPARTURE SHORTLY AFTER FLAP RETRACTION. THE AIRCRAFT LANDED SAFELY AT LAS WHERE IT WAS TOWED TO THE GATE. **SUPPLEMENTAL REPORT FOR AALA202302243929: MAINTENANCE FOUND ELECTRIC PUMP 3083GM CHECK VALVE TUBE ASSEMBLY BROKEN CLEAN THROUGH AND THE YELLOW HYDRAULIC SYSTEM PRESSURE LINE IN THE PYLON LEAKING. (AALA202303077492) MAINTENANCE REPLACED BOTH HYDRAULIC LINES / TUBES AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK. ** (CLOSED)