As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ECAM MSGS HYD B SYS LO PR AND HYD B RSVR LO LEVEL HYD PAGE SHOWING LOW LEVEL ON BLUE SYS. REFER TO L/P 4377610. WORK HAS BEEN COMPLIED. FOUND O-RING IN PRESSURE SWITCH ABOVE MANIFOLD BEHIND LEFT GEAR DOOR HANDLE PANEL LEAKING HYDRAULIC FLUID. REPLACED O-RING AND INNSTALLED PRESSURE SWITCH IN REFERENCE WITH AMM 29-12-17-400-001A. OPS CHECK PASSED NO LEAK NOTED AT THIS TIME. HYDRALIC SERVICED.