As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO PLATFORM, DURING TAXING THE RT PACK TEMP REACHED MORE THAN 60 CELSIUS DEGREES & BOTH PACKS REACHED LESS THAN 18 CELSIUS DEGREES IN PAX CABIN. THE TEMP CONTROL VLV FAILED SO THE REPORT WAS DEFERRED IAW MEL 21-33 CAT C AT GDL, THE TEMP CONTROL VLV WAS REPLACED IAW AMM 21-51-10, TESTED CORRECT.