As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PRIOR TO ITS DEPARTURE, FOUND HYD LEAK FROM THE ENG 1 RT THRUST REVERSER LOCKING ACTUATOR. THE ACFT WAS HELD ON GND FOR THE ACTUATOR REPLACEMENT IAW AMM 78-32-43 PB 401 WITH NO LEAK NOR FAULT. THE ACFT WAS RETURNED TO SERVICE ONCE THE MENTIONED CORRECTIVE ACTION WERE TAKEN.