As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONTROL CABIN WENT TO 65 DEGREES C AFTER T/O. NOT CONTROLLABLE IN NORMAL RANGE. TURNED ALL CONTROLLERS OFF. TEMP CAME DOWN. AT FL350 CONTROL CABIN STABILIZED AT 42 DEGREES C, FWD CAB 24 C. AFT CAB 24 DEGREES C, LT PACK 29 DEGREES C, RT PACK 24 DEGREES C. ACFT GROUNDED. ON DEFERRAL.