As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING COCKPIT CHECK FOUND STATUS MSG RECIRC FAN LWR LEFT. DEFERRED LEFT LWR RECIRC FAN INOP AS PER MEL 2125M. MAINTENANCE PROCEDURE C-W. INSTALLED PLACARD. REPLACED LWR LEFT RECIRCULATING FAN PER MM. NEEDS RECIRC FAN POST INSTALLATION TEST.