As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 71 JFK -SLC. "AFTER LANDING SHORTLY AFTER STARTING THE APU A STRONG BURNOUT ODOR WAS DETECTED IN THE COCKPIT AND FWD GALLEY APU BLEED WAS TURNED OFF ODOR DISSAPATED. INFLIGHT REPORTED A SLIGHT HAZE IN THE CABIN. NO VISIBLE HAZE IN THE COCKPIT.;PERFORMED FIM TASK BD500-A-J21-22-00-04AAA-423A-A. ISOLATED APU AND COULD NOT DUPLICATE. DEFERRING APU AS PRECAUTIONARY REF 4607501-2 LOGPAGE."