As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE SMOKE FILLED COCKPIT. SUSPECT FLOOR HEAT RIGHT AFT CAPT'S SEAT. TRANSFERRED TO NON MEL NR 10, FOUND FLOOR HEATER DEFECTIVE. DISCONNECTED HEATER, PULLED C/B'S AND COLLARED. DEACTIVATED FLOOR HEATER PER MA AM-2140-02;00. THIS CLEARS NON MEL NR 10.