As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUSELAGE SKIN LOCATED DIRECTLY BELOW DUCT ASSY SHOWS SIGNS OF PEELED PAINT DUE TO MIX CHAMBER DUCT ASSY HOT AIR LEAK. MIX MUFF DUCT OF DUCT ASSEMBLY LOCATED IN MIX CHAMBER AIR DISTRIBUTION BAY AT APPROXIMATE STA 540, BL 0 BLOWN CAUSING HOT AIR TO ESCAPE AND DAMAGE THE STRUCTURE BENEATH.REPAIRED FUSELAGE SKIN FROM FS 520 - 526 BETWEEN STRINGER 26L AND 27L AND REPLACED DUCT ASSEMBLY.