As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECIRCULATING MESSAGE ON EICAS ALL CABIN RECIRCULATING FILTERS MUST BE REPLACED. ONE IN MID GALLEY CEILING FOUND COMPLETELY PLUGGED WITH INSULATION MATERIAL, REPLACED UPPER RECIRCULATING AIR FILTERS. LOWER RECIRCULATING FILTERS STILL NEED TO BE REPLACED. REPLACED ALL 4 LOWER RECIRCULATING AIR FILTERS.