As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENGINE START "AFT CAB ZONE TEMP" LIGHT ACTIVATED WHEN RECALL PUSHED THEN EXTINGUISHED "MASTER CAUTION PUSH TO RESET" PUSHED RAN QRH 2.11. CONFIRMED BY BITE TEST THAT AFT ZONE TRIM VALVE FAILED. REMOVED AND REPLACED AFT CABIN ZONE TRIM AIR MODULATING VALVE, OPS CHECK NORMAL IAW 21 61 21 000 801. SEAMC NOTIFIED ROTABLE COMPONENT (VALVE) VERIFIED BY SEAMC, PER SEAMC GROUND VERIFICATION SUCCESSFUL.