What was found
COULD NOT CONTROL CABIN AIR TEMPERATURE, TOO HOT. SWITCHED TRIM AIR OFF AND CABIN AIR TEMPERATURE SLOWLY COOLED, BUT STILL SOMEWHAT DIFFICULT TO CONTROL. ACFT GROUNDED. FOUND ALL 3 AIR TEMP FILTERS DIRTY, REPLACED ALL 3 AIR TEMP FILTERS IAW AMM 21-61-06. NO FAULTS LOGGED NR 1 & NR 2 TEMP CONTROLLERS. NR 1 & NR 2 TEMP CONTROLLERS BITE CHECK NORMAL. RAN LT & RT PACKS 20 MINUTES. BOTH NR 1 & NR 2 AIR CONDITIONING SYSTEM GROUND FUNCTIONAL, CK NORMAL.