What was found
IAH - FLT NR 2594 - DURING DESCENT, PILOT REPORTED THAT THE GREEN HDYRAULIC SYSTEM LOW PRESSURE LIGHT ILLUMINATED IN FLIGHT. PRESSURE DROPPED TO ZERO, ATTEMPTED ONE RESET UNSUCCESSFULLY, PERFORMED MANUAL GEAR EXTENSION AND THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE SERVICED THE HYDRAULIC SYSTEM, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (M)