What was found
ACFT ARRIVED AT DESTINATION WITH A REPORT OF VERY STRONG ELECTRIC/PLASTIC BURNING ODOR OVER 2D, 2F. ODOR DISIPATED AFTER IFE SHUTDOWN. THE ACFT WS INSPECTED BY MAINTENANCE AND NO DEFECTS WERE NOTED. IFE SYSTEM WAS INSPECTED REF TBN 4430-04 WITH NO DEFECTS NOTED. PERFORMED TROUBLESHOOTING IAW TSM 05-50-00-810-831-A. COULD NOT DUPLICATE ODOR ANYWHERE IN THE CABIN. PERFORMED ENGINE IDLE RUN FOR 5 MINUTES WITH BOTH PACKS AND ALL BLEEDS ON. ALL CABIN ODOR NORMAL. OK FOR SERVICE, MCC NOTIFIED. NO FURTHER PROBLEMS REPORTED ON SUBSEQUENT FLIGHTS.