What was found
CMH - DIVERSION - FLT 820 - "C" - WHILE ENROUTE FROM PHX TO BOS FLIGHT CREW RECEIVED LOWER ECAM WARNING MESSAGE THAT OXYGEN REGULATOR PRESSURE WAS LOW SHORTLY AFTER PILOT TESTED MASK. FLIGHT WAS DIVERTED TO CMH WHERE AIRCRAFT MADE AN UNEVENTFUL LANDING. AT CMH MAINTENANCE REPLACED BOTH THE CREW OXYGEN BOTTLE IAW T/C R2A35301, AND THE CREW OXYGEN REGULATOR IAW AMM 35-13-15-04. LEAK CHECK OF THE OXYGEN BOTTLE, MASK, AND HOSES WAS GOOD WITH NO LEAKS NOTED. PART NAME: CYLINDER, OXYGEN, MANF: INTERTECHNIQUE, P/N: 891511-14, COND: DEPLEATED, LOC: ZONE 125.