What was found
CONT CABIN 'ZONE TEMP' ILLUMINATES ON RECALL AND EXTINGUISHES WITH MASTER CAUTION RESET. GROUNDED - YES. PACK/ZONE TEMP CONTROLLER BITE PER B737-900 FIM 21-62 TASK 801 SHOWED FAULT FOR CONTROL CABIN TEMP CONTROL VALVE BUT VERIFY TEST DID NOT CONFIRM FAULT. FOUND CONTROL CABIN TEMP SENSOR AND FILTER DIRTY - CLEANED SENSOR AND REPLACED FILTER. PERFORMED CABIN TEMP CONTROL AND INDICATION OPERATIONAL TEST PER B737-900 AMM 21-61-00-700-807-002 AND PZTC BITE PER ABOVE FIM - ALL TESTS PASS.