As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNUSUAL HEAT BLOWING FROM FLOOR LEVEL SIDEWALL VENTS AT LEFT SIDE ROW 38. INSPECTED REAR AND BULK CARGO HEAT VALVES. FOUND ON BULK CARGO HEAT VALVE UPPER PIPING CLAMP CONNECTION SLIGHT HOT AIR ESCAPING. CHECK TIGHTENED CLAMP CONNECTION AND SUBSEQUENT LEAK CHECK NOW SATISFACTORY AND NO MORE WARM AIR FROM FLOOR PANELS AT REAR LEFT CABIN. RELEASED A-C FOR SERVICE.