As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER 1 HOUR INTO FLIGHT, CREW OBSERVED A CARGO DISCHARGE 1 LIGHT ILLUMINATED. NO CORRESPONDING ECAM OR SMOKE IND ON CARGO PANEL. FLIGHT DIVERTED TO DENVER. TROUBLESHOT AND VERIFIED NR 1 BOTTLE LOW PRESSURE SW AT FAULT. REPLACED NR 1 BOTTLE IAW AMM 26-23-41-04. OPS TEST NORMAL.