As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FLT 741 - CREW HEARD A LOUD THUMP AFTER TAKEOFF FROM PIT. ON GEAR RETRACTION, THE CENTER HYDRAULIC SYSTEM WAS LOST. CREW RECEIVED LOW PRESSURE INDICATIONS FROM ALL THE SYSTEMS. FLIGHT RETURNED TO PIT AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE CENTER SYSTEM HYDRAULIC PRESSURE TRANSMITTER INOPERATIVE AND REPLACED IT. (M)