As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
USED APU FOR ELECTRICAL POWER DURING START WITH AN AIR CART. ODOR STARTED SHORTLY AFTER APU START, ODOR DISAPPEARED ABOUT 1 HR. AFTER START. COULDN'T DETERMINE IF ODOR CAME FROM AIR CART OR APU. C/W CARD 0550-2002 AND 0550-2003. NO DEFECTS NOTED. (LP# 4190076)