What was found
UPON "RECALL" ON THE AFTER START CHECK LIST, CONTROL CABIN ZONE TEMP LIGHT ILLUMINATES. LIGHT RESET UPON MC PUSH TO RESET. ACFT GROUNDED. ACCOMPLISHED PACK/ZONE TEMP CONTROLLER BITE TEST, CONTROLLER NR 1 NO FAULTS, CONTROLLER NR 2 FAULTED TRIM VALVE FLT DECK, V143. CLEARED FAULT. RAN PACKS FOR 1 HOUR WITH NO ZONE TEMP ISSUES. ACCOMPLISHED CABIN TEMP CONTROL AND IND OPS TEST, TEST PASSES. REACCOMPLISHED PACK/ZONE TEMP CONTROLLER BITE TEST, BOTH CONTROLLERS SHOW NO FAULTS, REF AMM 21-61-00-700-806-002, & 21-61-00-700-807-002.