As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYD PRESS #4 EICAS MESSAGE HYDRAULIC DEMAND PUMP #4 FAILED IN CRUISE. REPLACED ENGINE DRIVEN PUMP TO SUPPLY HYDRAULIC PRESSURE. ENG #4 HYD DEMAND PUMP TRANSFER TO DMI 248309 PER MEL 29-11-02-04 CAT C. R & R HYD SYS 4 DEMAND PUMP IAW AMM 29-22-17. LEAK & OPS CHECK GOOD. THIS CLEARS DMI 248309. PLACARDS REMOVED.