What was found
ALL THREE ZONE TEMP CONTROLS IN AUTO ARE "HYPER" SENSITIVE. SLIGHTEST ADJUSTMENT SPIKES TEMPERATURE HOT OR COLD. SUSPECT FILTERS OVER TEMP SENSORS DIRTY. GROUNDED - YES. PERFORMED BITE CK OF BOTH CONTROLLERS. NO DEFECT REF B737-800 FIM 21-62 TASK 801. CLEANED ALL ZONE TEMP SENSOR FILTERS REF B737-800 AMM 21-61-06-000-801 AND 21-61-06-100-801. COMPLETED FIM TASKS 21-61 863 AND 864. NO DEFECT ALL CHECKS GOOD.