As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAVATORY 3F1RC HAD AN ELEC BURNING SMELL, NO SMOKE VISIBLE. FLIGHT ATTENDANT TURNED ELEC DRAIN SWITCH TO OFF & SMELL DISSIPATED. FOUND THE LAVATORY 3F1RC GWIV PC BOARD BURNT. R & R GWIV IAW AMM 38-31-11. OPERATIONAL & LEAK CHECKED GOOD.