What was found
ON TAXI OUT @ SEA DURING AFTER START CHECKLIST- RECALL WE GOT AN AIR CON. M.C. W/CONT CAB ZONE TEMP LIGHT. EXTINGUISHES DURING M.C. RESET. GROUNDED - YES. REF B737-800 FIM 21-62 TASK 801. NO ZONE TEMP LT ON RECALL. PACK TEMP CONTROLLER BITE FOR #1 & #2 SHOWS NO FAULTS. CONTROL CABIN TEMP SENSOR FAN & FILTER, DIRTY. CLEANED, REF B737-800 AMM 21-61-06. OPERATED PACKS, NO DEFECTS NOTED. THIS CLEARS MEL 21-21G.