As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GNDED. SHORTLY AFTER TAKEOFF THE CREW NOTICED A GREEN HYD SYS LOW PRESS INDICATION, SWITCHED PUMP SWITCH OFF IAW ECAM PROCEDURE & ELECTED TO RETURN, WHERE THE ACFT LANDED SAFELY WITH NO ADDITIONAL INCIDENTS. REPLACED THE NR 1 ENG HYD PRESS SWITCH & ACCOMPLISHED A SATISFACTORY LEAK & OPERATIONAL CHECK IAW AMM 29-11-17.