As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C PACK HOT CAUTION LIGHT CYCLED CONTINUOUSLY. AT 16K. THERE WAS A BURNING ODOR ASSOCIATED WITH THE LIGHT AFTER SEVERAL MINUTES. FOUND DUCT SEPARATED AT CABIN TRIM VALVE BLOWING HOT BLEED AIR INTO AFT ACCESSORY COMPARTMENT. SECURED DUCTING RAN ENGINES BLEEDS HIGH FOR OVER 20 MINUTES NO ODORS OR LEAKS NOTED. ALSO, NO ASSOCIATED CAUTION LIGHTS INDICATED. CHECKED GOOD IAW MM 21-50-26 AND MM 21-11-00.