What was found
FOLLOW-UP TO REPORTS OF CONTROL CAB ZONE TEMP ILLUMINATED. GROUNDED - YES. ACCOMPLISHED PACK/ZONE TEMP CONTROLLER BITE TEST ON BOTH TEMP CONTROLLERS, OPS NML, NO FAULTS LOGGED REF B737-800 AMM 21-61-00-700-806-002. REMOVED AND REPLACED CONTROL CABIN TRIM AIR VALVE (V143), OPS NML REF AMM 21-61-21-400-801. ACCOMPLISHED BITE TEST ON BOTH CONTROLLERS, NO FAULTS, OPS NML REF AMM 21-61-21-400-801.