As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD AFT LAV DOOR SWITCH SHORTED CAUSING SMOKE IN AFT CABIN PRIOR TO DEPARTURE. REPLACED LAV DOOR SWITCH ASSY WIRES WERE NOT DAMAGED. ONLY THE MICRO SWITCH WAS DAMAGED. OPS TESTED AFTER RE-ASSEMBLY WITH NEW SWITCH. CHECKED GOOD AFTER MULTIPLE CYCLES (SWITCH CONTROLS THE FLUORESCENT LIGHTS)