What was found
ROW 20ABC WAS PRODUCING VERY HOT AIR FROM LOWER SIDEWALL PANEL. HAD TO MOVE PASSENGERS FROM THE AREA DUE TO HEAT. PILOTS AND F/A'S BOTH REPORTED NO ODOR OR FUMES. ABLE TO DUPLICATE ON GROUND. TURNING OFF LT PACK STOPPED LOUD NOISE AND UNBEARABLE HEAT. FOUND TRIM AIR DUCT AT MIX MANIFOLD DAMAGED CAUSING HOT AIR TO RISE ALONG SIDE PANELS AND INTO ZONE D. FOUND ONE OTHER TRIM AIR DUCT IN SAME AREA THAT IS DAMAGED AT THE MIX MANIFOLD. R & R MIX MANIFOLD DUCTS IAW AMM 21-20-04-000-801 AND 21-20-04-400-801. BOTH AFT DUCTS CHANGED DUE TO DAMAGE IS IN IPC 21-52-51-08 ITEM 165 & 162. OPS CHKD AND LEAK CHKD GOOD. ZONE D READING NORMAL.