As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SEAT 42-43 LEFT-HAND SIDE AREA, PNEUMATIC LOUD LEAK SOUND, BLOWING HOT AIR INTO CABIN. LASTED 30 SECONDS TO 1 MINUTE AT 3-MINUTE INCREMENTS. REPLACED AFT CARGO HEAT DUCTS IAW AMM 20-11-00 AND PERFORMED OPS CHECK PER AMM 21-44-00. LEAK AND OPS CHECK GOOD.