As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH CONTROL CABIN TEMP SELECTOR FULL WARM, FLIGHT DECK TEMP REMAINED COLD. ACFT GROUNDED. IAW TSR701473 FOR LEFT FLOW CONTROL AND SHUTOFF VALVE REPLACEMENT. NR 1 AND 2 PZTC BITE GOOD WITHOUT FAULTS. BOTH PACKS OPS CHECKED NORMAL ON GROUND. VERIFIED CONTROL CABIN TEMPERATURE INCREASED WITH TEMP SELECTOR MOVED TO WARM SIDE AND LEFT PACK TEMP INDICATIONS RISED AS WELL.