As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE AFT LAV WARNING AFTER TAKEOFF. A DISTINCT ODOR WAS NOTICED THROUGHOUT THE ENTIRE ACFT WHICH SMELLED LIKE SOMETHING WAS BURNING. ACFT RETURNED TO DEPARTURE AFTER T/O. PERFORMED ENGINE DRYOUT IAW AMM 72-00-00 TO DRY COMPRESSOR WASH FLUID.