As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAS-JFK - FLT 297 - AIR TURNBACK DUE TO LOSS OF LT HYDRAULIC SYSTEM FLUID, EICAS MESSAGE INDICATED FLUID LEVEL DROPPED TO .25. ACFT RETURNED TO LAS AND LANDED WITHOUT FURTHER INCIDENT. MX FOUND PRESSURE SWITCH ON LT HYDRAULIC MODULE IN LT PYLON DEFECTIVE. REMOVED AND REPLACED PRESSURE SWITCH. HYDRAULIC SYSTEM SERVICED, OPS AND LEAK CHECK GOOD. ACFT RETURNED TO SERVICE. (W)