As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/A REPORTED AN EXCESSIVELY HOT TEMPERATURE AT ROWS 6 - 12. TRIM AIR TURNED OFF IAW QRH. ACFT GROUNDED. RETURNED TRIM AIR SWITCH TO ON. BITE CHECKED BOTH ZONE TEMP CONTROLLERS IAW FIM 21-61, TASK 801, NO FAULTS. FOUND FWD ZONE FAN FILTER COMPLETELY BLOCKED. CLEANED IAW AMM 21-61-06. RAN BOTH PACKS WITH TEMP SELECTOR FULL COLD, COLD AIR COMING FROM ALL PSU'S. OPS NORMAL IAW AMM 21-61-00.