As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL FLT 723 EN ROUTE DUB TO PHL. DURING DESCENT INTO PHL, THE LT HYDRAULIC SYSTEM QUANTITY DECREASED TO ZERO AND THE SYSTEM PRESSURE LIGHT ILLUMINATED. ALSO, EICAS MESSAGE "G L HYD SYS PRESS" DISPLAYED. THE FLIGHT LANDED SAFELY AND WAS ABLE TO TAXI OFF THE RUNWAY, BUT WAS TOWED TO THE GATE. MAINTENANCE REPLACED A HYDRAULIC DRAIN TUBE. SYSTEM OPERATIONALLY AND LEAK CHECKS OK. (A)