What was found
DISCREPANCY: STRONG BURNING RUBBER SMELL MID-FLIGHT ROWS 13-14 DURING DESCENT. / PERFORMED TSM 05-50-00-810-831-A DECISION TABLE MOST PROBABLE CAUSE APU. PERFORMED AMM 49-00-00-200-812-A. FOUND OIL ON INTAKE FLAP CLEANED AREA, OPENED APU AND INSPECTED, NO OTHER DEFECTS NOTED, RAN EACH PACK INDIVIDUALLY, NO ODOR NOTED.