What was found
OUT 10000 FT, REAR ITMS SMELLED A BURNED PLASTIC ODOR. SEVERAL MINUTES LATER FRONT ITM ALSO SMELLED A BURNED PLASTIC ODOR. AT GATE, NO ODOR. PERFORMED IFE SYS CHECK AFTER SMOKE IN CABIN EVENT IAW TBN443004. OPS CHECKED NORMAL, COULD NOT DUPLICATE.