As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMELLED SMOKE AT 28K CRZ FOLLOWED BY AFT LAV SMOKE DETECTORS AND VISIBLE SMOKE AROUND CEILING OF CABIN. WITHIN 3 MINUTES SMOKE HAD DISSIPATED. INSP ACM AND ENG, NTF. PERFORMED DUCT BURNOUT AND REPLACED COALESCOR BAGS. RAN ENGINES, CKS GOOD.