As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM: "CAB CONT" TEMP SELECTOR MAX HOT AND COCKPIT TEMP NEVER GOT ABOVE 11 C. ACCOMPLISHED BITE TEST ON PACK/ZONE TEMP CONTROLLER IAW B737-400 M/M 21-63-83 OPS CHECK NORMAL NO FAULTS NOTED. ACCOMPLISHED SYSTEM TEST OF THE TEMPERATURE CONTROL SYSTEM IAW B737-400 M/M 21-61-00 OPS CHECK NORMAL.