As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CAB ZONE TEMP ANNUNCIATOR ILLUMINATED ON RECALL. EXTINGUISHES WHEN RESET. GROUNDED - YES. ACCOMPLISHED PACK/ZONE TEMP CONTROLLER BITE EST REF B737-800 AMM 21-61-00, SHOWS HARD FAIL "ZONE TRIM VALVE" ON NR 1 CONTROLLER. ACCOMPLISHED B737-800 FIM 21-62 TASK 835 AFT CABIN TRIM AIR VALVE FAULT ISOLATION. REMOVED AND REPLACED AFT CABIN TAV V145 REF AMM 21-61-21, OPS CHECK AND LEAK CHECK GOOD.