As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, LT HYDRAULIC QUANTITY SHOWED ZERO. RETURNED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND HYDRAULIC LINE TO PTU PRESSURE SWITCH CRACKED. REMOVED AND REPLACED LINE IAW BOEING 757 MM 29-31-00 AND BOEING 757 MM 20-11-00. NO LEAKS WERE NOTED.