As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB-OUT WITH BOTH AIR MIX VALVE IND INDICATING FULL COLD, DUCT TEMP WENT TO 120. NO TEMP CONTROL IN AUTO OR MANUAL EITHER PACK. AIR TURNBACK TO MCO. REPLACED RT PACK 35 DEG CONTROLLER AND SENSOR. ALL CKS OK FOR RT PACK. FOUND LT PACK ACM FROZEN. REPLACED SAME.