What was found
FLT 1927 - ORD - STRONG ODOR OF BURNING RUBBER OR OIL IN CABIN, JUST FORWARD OF OVERWING EXITS, DURING APPROACH, BEFORE LANDING GEAR WAS LOWERED. INSPECTED CABIN LIGHTING, OPERATED LEFT AND RIGHTS PACKS, NO DEFECTS NOTED. CHECKED C/B'S, NONE TRIPPED. AIRCRAFT OK FOR CONTINUED SERVICE. (M)