As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE ECAM DISPLAYED "HYD G SYS G LO PR" MESSAGE. SYSTEM PRESSURE INDICATED 3000 PSI. ALL GREEN SYSTEM FLIGHT CONTROLS INDICATED AMBER. NORMAL & AUTO BRAKES INDICATED INOPERATIVE. ALL SYSTEMS FUNCTIONED NORMALLY. AIRCRAFT WAS GROUNDED. REMOVED AND REPLACED GREEN SYSTEM PRESSURE SWITCH IAW AMM 29-32-12. SYSTEM CHECKED NORMAL.