As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 668 - PHX - ON FINAL APPROACH THE AFT RIGHT LAVATORY SMOKE DETECTOR SOUNDED. FLIGHT ATTENDANT CHECKED LAVATORY COULD FIND NO FIRE BUT SMELLED A BURNED ELECTRICAL ODOR. ODOR WAS NOTICED AT AFT LEFT ATTENDANT WORK LIGHT. NO DEFECTS FOUND, NEW LAMPS INSTALLED IN WORK LIGHT.