What was found
WHILE BEING TOWED OFF THE GATE BEFORE STARTING ENGINES THE F/A CALLED TO REPORT A "BURNED RUBBER" SMELL EMINATING FROM MID CABIN NEAR EXIT ROWS. COULD NOT DUPLICATE REF FIM 21-00-00-810. RAN APU & PACKS ALONG W/ LIVE TV, NO DEFECTS. INSPECTED LTV BOXES, RACK, EXHAUST DUCT AND FAN IN O/H BIN, NO DEFECTS. INSPECTED SEAT POWER OUTLETS & WIRING ABOVE CEILING PANELS ROWS 14-24. TAXI A/C WITH NO SMOKE OR BURN SMELL NOTED. REF L/P4439317 FOR LTV. A/C OK FOR SERVICE.