What was found
LEFT PACK LIGHT ILLUMINATES ON RECALL. EXTINGUISHES UPON MASTER CAUTION RESET. GROUNDED - YES. REF B737-900 FIM 21-62 TASK 801, 837 PERFORMED BITE OF PACK/ZONE TEMPERATURE CONTROLLER. LEFT CONTROLLER HAS FAULT RAM AIR ACT. VERIFY SHOWS NO FAULTS. FAULT NOT ACTIVE. HAS HISTORY. LEFT RAM AIR ACTUATOR REPLACED 3 DAYS PRIOR ON DEFECT 12179744. CHECK OPERATION OF FLAPS UP SWITCH PER FIM 21-51 TASK 803. MODULATION DOORS OPERATED CORRECTLY. AIRPLANE TEMP PUT IN AIR MODE PER B737-900 AMM 32-09-00. AS A PRECAUTION REMOVED AND REPLACED LEFT PACK RAM AIR CONTROL TEMP SENSOR IAW AMM 21-51-50. PZTC BITE NO FAULTS.