As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUDDEN STRANGE ODOR IN CABIN SMELL NOTICED WHILE APU AND PACKS RUNNING. TIMING OF SMELL COINCIDED WITH RAMP OPENING FWD CARGO PITS AND POSITIONING LOADER. VERIFIED WITH CAPTAIN AND CREW SMELL WAS SIMILIAR TO LOADER EXHAUST SMELL ENTERED FORWARD ELECTRONICS BAY TO VERIFY, NO SMELL OR LEAKS. SMELL WAS GONE AFTER RETURNING UPSTAIRS WITH PACKS STILL RUNNING. OK FOR SERVICE DMC-B787-A-05-51-99-99A-282A-A