As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
**ATB** AT FL310 CRUISE ALTITUDE, CAB ALT ECS EICAS AMBER ILLUMINATED.8500FT INDICATED WITH 500 FPM RATE OF CLIMB CABIN ALTITUDE OF 9800 FT REACHED.A PRECAUTIONARY DECENT INIATATED AND PACKS HIGH FLOW STOPPED REF T3F18E001Y7A3. AS PER BOEING RECOMMENDATION REMOVE AND REPLACE FORWARD CARGO OVERBOARD EXHAUST VALVE (V526) AS PER AMM 21-26-17/401. PERFORMED FWD CARGO OVBD CMC GRD TEST AS PER AMM 21-26-00-700-818-001. GRD TEST PASSED.