As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ENG START, SELECTED PACKS ON HAD STRONG FUME ODORS IN BACK OF CABIN, REPORTED BY THE AFT CABIN AREA FLIGHT ATTENDANTS THAT WAS A FUEL ODOR AFTER ENG START FOR ABOUT 5 MINS UNTIL IT CLEAR OUT OF CABIN. REPORTED ONLY HAVING THIS ISSUE OUT OF LHR. VERIFIED NO FUEL ODOR WAS PRESENT WHEN PLANE ARRIVED IAW AMM 05-51-00. OK TO CONT.