As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT ENGINE: FOUND HEAVY LEAK ON THE MAIN HYDRAULIC PUMP. RT MAIN HYD PUMP REPLACED IAW AMM. DRY RUN PERFORMED AND NO LEAK OBSERVED. GND IDLE RUN WILL BE PERFORMED BY CREW BEFORE DEPARTURE. DUE TO RH HYDRAULIC PUMP REPLACEMENT ACCOMPLISH ENGINE RUN TEST. PRIOR TO ENGINE RUN VERIFY ALL ENGINE COWLS ARE CLOSED. RH HYD EDP REPLACED AS PER AMM AND ENG 2 RUN TEST PERF. ALL OK P/N ON MR29157 SN 254821AB PN OFF MR29157-167.