As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BURNING ODOR COMING FROM APU BLEEDS. INSPECTED APU COMPARTMENT WITH NO DEFECTS OR SIGNS OF ANYTHING BURNED. FOUND APU OIL SLIGHTLY OVER SERVICED. DRAINED OIL TO PROPER LEVEL. RAN APU BLEEDS FOR 30 MINUTES WITH NO BURNING ODOR NOTICED. OK FOR SERVICE.