What was found
BOTH FWD AND AFT CABIN TEMP GAUGES FOR SUPPLY DUCT AND PACK READINGS ABNORMALLY LOW, 10 DEG C TEMP CONTROLS OPERATED NORMALLY. GROUNDED - YES. ACCOMPLISHED T/S PER FIM 21-61 TASK 857. NO DEFECTS NOTED. REMOVED AND REPLACED P5-17 TEMPERATURE CONTROL MODULE IAW AMM 21-61-15. REMOVED AND REPLACED CABIN TEMP INDICATOR IAW AMM 21-61-32. REMOVED LIGHT PLATE AND KNOBS AND RE INSTALLED ON NEW TEMP CONTROL MODULE IAW CMM 31-36-99. ALL OPS CHECKS NORMAL. CLEARED MEL 21-17E, 21-17F AND 21-17G.