As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COULD NOT CHANGE COCKPIT TEMPERATUER WITH ANY OF THE TEMP CONTROL KNOBS. CARGO AREA WAS 80 DEGREE F, FLT DECK VALVE INDICATOR SHOWED FULL COLD. NO CHANGE IN AUTO MODE. FOUND PACK TEMP CONTROL VALVE INDICATING CLOSED/NOT MODULATING, VALVE CONTROL KNOB LOOSE AND JERKY. REPLACED PACK TEMP CONTROL VALVE IAW AMM 21-51-01 OPS CHECK AND LEAK CHECK NORMAL. PART IS UNKNOWN TO TRAX (ORIGINAL TO AC).