What was found
ON RECALL LEFT PACK LIGHT ILLUMINATES. CLEARS WITH MASTER CAUTION RESET. GROUNDED-YES. RESOLVED ON W/O: 1851647 TASKCARD: N/R-00002. ON BITE TEST, ZONE TRIM VALVE LOGGED AS FAULT ON NR 1 PZTC. ACCOMPLISHED TASK 21-62 TASK 835, REPLACED AFT CABIN ZONE TRIM AIR MODULATING VALVE, REF B737-800 MM 21-61-21-400-801. OPERATIONS NORMAL, REF MM 21-61-00-700-806-002. OPENED AND CLOSED ONE C/B. GROUND VERIFICATION SUCCESSFUL. THIS CLEARS MEL 21-32B, REMOVED PLACARD C/N 28036534, NOTIFIED " SCOTT " SEAMC.