What was found
BOTH LEFT AND RIGHT PACK LIGHTS AND ZONE TEMP LIGHTS CAME ON DURING CRUISE AT 38000 FEET . MASTER CAUTION PUSH TO RESET EXTINGUISHED LIGHTS , NO OTHER INDICATION. GROUNDED - YES. PERFORMED B737-800 FIM 21-53 TASK 820 AND FIM TASK 21-62 TASK 801, FOUND ZONE TEMP CONT 2 FAILED TO PERFORM BITE, CLOSER INSPECTION FOUND SIGNS OF FLUID NEAR THE ZONE TEMP CONT, C/W CONDITIONAL INSPECTION PER B737-800 AMM 05-51-13-211-801 THEN REPLACED THE ZONE TEMP CONT 2 REF AMM 21-61-20/401, BITE CLEARED ALL FAULTS AT THIS TIME, NO FURTHER DEFECTS NOTED IN THE E/E BAY OR FWD GALLEY, OPS CK NORMAL A/C IS OK FOR SERVICE.