As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF, GOT YELLOW HYD PUMP PRESS LOW. TURNED OFF PUMP IAW ECAM AND COMPLIED WITH QRH. YELLOW SYSTEM OPERATED NORMALLY ON PTU. DISCOVERED YELLOW HYDRAULIC RESEVOIR BAD. REMOVED AND REPLACED YELLOW SYSTEM RESERVOIR 293000 IAW AMM 29-13-46-04. LEAK CHECK GOOD.