As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CABIN ZONE TEMP LIGHT ILLUMINATED DURING RECALL AND EXTINGUISHED QRH RESET. ACFT GROUNDED. FOUND AFT CABIN FILTER DIRTY. CLEANED FILTER. RAN PACKS, NO FAULTS FOUND ON BITE CHECK. OPS CK GOOD REF AMM 21-61-10-100-801 AND FIM 21-61 TASK 801.