As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONT CABIN SUPPLY DUCT TEMP UNCONTROLLABLE IN MANUAL AND AUTO DURING TAXI OUT FOR T/O GROUNDED. CREW REPORTS TEMP CONTROL REGAINED AFTER TURNING OFF AND ON BOTH PACKS. PERFORMED PACK BITE TEST REF MM 21-51-00, NO FAULTS CURRENT OR HISTORY, VERIFY GOOD. NO HISTORY 30 DAYS. OK FOR SERVICE.