As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TAIL DE-ICE BOOTS WOULD NOT INFLATE. FOUND DE-ICE SUPPLY LINE COLLAPSED AND PINCHED CLOSED DUE TO HEAT DUCT BELOW FLOOR TO HAVE A SPLIT SEAM ALLOWING HOT AIR TO HEAT PLASTIC DE-ICE HOSE, SOFTEN, THEN BE SUCKED CLOSED FROM THE NORMAL VACUUM SUPPLIED TO BOOTS. REPAIRED BY REPLACING DE-ICE SUPPLY HOSE AND PERFORMING RED GREEN REPAIR TO THE HEAT DUCT.