As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CABIN TEMP CAUTION MSG IN FLIGHT @FL390 CABIN ALT 7000 CABIN DIFFERENTIAL PRESS 8.4 PSI. T/S IAW FIM 21-61 FAULT TREE 803 AND AMM 21-61-03. REMOVED AND REPLACED ZONE TEMP CONTROLLER UNIT IAW AMM 21-61-03. OPS TEST GOOD. STATUS MSG CLEARED.