As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT# 604 YVR- JFK (ETOPS). " HYD-Y SYS LO PR ECAM. LOST NW STEERING. REGAINED N/W STEERING W/YELLOW ELECTRIC PUMP ON. ECAM CONTINUED TO CYCLE OFF AND ON. WE EMER CNX ECAM. Y SYS SHOWED NORMAL PRESSURE. PTU NEVER TURNED ON.; FOUND 3151GN TO BE AT FAULT. REMOVED AND RPLACED 3151GN SYSTEM PRESSURE SWITCH IAW AMM 29-32-12. OPS CHK OK. A/C OK FOR SVC."