As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CONTROL CABIN HEAT KNOB FULL HOT, COCKPIT VERY COLD. ACFT GROUNDED. PERFORMED NR 1 AND 2 PZTC BITE CHECKS. NO FAULTS FOUND IAW AMM 21-61-00. SWAPPED THE NR 1 PZTC (M1442) AND 2 PZTC (M1443) POSITIONS. REMOVED AND REPLACED THE NR 1 PZTC (M1442). OPS CHECKED GOOD IAW AMM 21-61-20. REMOVED AND REPLACED THE CONTROL CABIN TRIM AIR VALVE IAW AMM 21-61-21, OPS AND LEAK CHECKED GOOD. PERFORMED COOLING PACKS OPS AND ALL ZONES RESPONDED ACCORDINGLY AND TEMPS SATISFACTORY IAW AMM 21-61-00.