As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER BLOCK OUT AFT CABIN TEMP INOP CAUTION MSG, NON CREW DEFERRABLE AND RETURNED TO GATE (BTB) MTX GROUNDED A/C ANDDEFERRED AFT CABIN TEMP CONTROL SYSTEM IAW ABX MEL 21-61-1-2. MBCB 10-30-26. C/W MX PROCEDURE 21-61-1. VALVE IS REMAINING CLOSED PLACARDS INSTALLED REMAINS NO ETOPS.AND RETURNED A/C TO SERVICE.