As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: SMOKE SMELLED BUT NOT OBSERVED IN THE AFT CABIN DISSIPATED AFTER5 MINUTES NO OTHER INDICATIONS. FOUND A BURNED AFT BALLAST IN THE AFT CARGO COMPARTMENT. REPLACED BALLAST AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 33-34-11.