What was found
F/A'S REPORT CABIN EXTREMELY WARM WITH TEMP CONTROLS SET AT 9-10 O'CLOCK POSITION TO GET DUCT TEMPS BELOW 30 DEGS. TEMP RESPONDS TO CONTROL MOVEMENT BUT VERY ERRATICALLY. ACFT GROUNDED. TROUBLESHOT IAW FIM 21-61 TK 863. OPS NORMAL. PACK/ZONE TEMP CONTROLLERS BITE NORMAL AND NO FAULT STORED. FOUND FWD AND AFT CABIN TEMP SENSOR FILTERS COMPLETELY PLUGGED. R & R BOTH CABIN FILTERS AND COCKPIT FILTER IAW AMM 21-61-06.