As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT LOST HYD PRESSURE AFTER DROPPING 1ST LOAD OF THE DAY. ACFT RETURNED TO BASE AND COMPLETED A LANDING WITH EMERG HYD SYS. HYD LINE AT WATER PROBE ACTUATOR FOUND TO BE LOOSE. RT ENG DRIVEN HYD PUMP FOUND TO BE LEAKING AT DRIVE SEAL. HYD LINE WAS TIGHTENED AND THE PUMP REPLACED. SYS GROUND FUNCTION CHECKED SERVICEABLE AND ACFT WAS RETURNED TO SERVICE.