What was found
CONTROL CAB TEMP CONTROL ERRATIC. SET AUTO FULL COLD AND MAINTAINS 21 DEGREES C SUPPLY. THEN WENT UNCOMMANDED TO 45 DEGREES C FOR AWHILE, THEN EVENTUALLY RETURNED TO 21 DEGREES C, STABILIZED FOR 30 MIN AT 21 DEGREES C THEN WENT UNCOMMANDED TO 0 DEGREES C. GROUNDED - YES. ACCOMPLISHED FIM TASK 21-61, TASK 861 STEPS I, K (1)(3)(4) AND FOUND DEBRIS AT THE CONTROL CABIN ZONE TEMPERATURE SENSOR, FILTER, FAN AND DUCTING. CLEANED DUST BLOCKAGE AND ACCOMPLISHED INITIAL EVAL. AND FOUND CONT CAB TEMP STABLE AT ALL SETTINGS, OPS. NORMAL. ACCOMPLISHED BITE TEST OF RIGHT PACK/ZONE TEMP CONTROLLER, M1443, NO FAULTS. ACCOMPLISHED TEST OF THE TRIM AIR PRESSURE REGULATING AND SHUTOFF VALVE, TEST NORMAL. REPAIR CONFIRMATION ACCOMPLISHED, SYSTEM OPS. NORMAL.