As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PACK FCV L STATUS MSG. ON LT PACK TROUBLESHOOTING, BOTH PACK FCVS HAD DIFFERENT PROBLEM ON GROUND TEST. SWAPPING ONE BENEATH THE OTHER UPPER AND LOWER PACK FCV. NOW THE UPR FLOW CONTROL VALVE OPS & INDICATION NORMAL. TEST THROUGH CABIN CTLR PASSED. THE LOWER LT PACK FCV FAILED THE TEST. LT PACK LWR FCV REPLACED, OPS CKS OK.