As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW OBSERVED FOREIGN ODOR ON ENTERING THE AIRCRAFT. TROUBLESHOT THE ODOR IAW TSM 05-50-05-810-831-A. MX WAS UNABLE TO DUPLICATE THE ODOR. MX THEN ACCESSED APU/PACK AND PERFORMED GVI OF ALL AREAS WITH NO DEFECTS OR LEAKS NOTED. MX THEN RETURNED AIRCRAFT TO SERVICE.