As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIVERSION IN TO LHR FROM VCE. CREW VERBAL: AFT CABIN TEMP UNCONTROLLABLE, VERY COLD STS MSG AND AUTO SNAPSHOT PHOTO UPDATE. L TRIM AIR CONT, AFT TEMP CONT STS. AFT CABIN TRIM VLV IND BLANK, IND CAME BACK WITH RESEATING THE CONNECTOR REF AMM 21-61-07-401. REPLACED AFT ZONE TRIM AIR MODULATING VALVE IAW AMM 21-61-07/401 CONFIG 2. VALVE OPERATION AND INDICATION ALL NORMAL. CTC TEST CARRIED OUT IAW AMM 21-61-20/201 AND TEST PASSED. CONSIDERED SERVICEABLE.