What was found
DURING BOARDING RT AFT LAVATORY SMOKE DETECTOR WENT OFF. PAX COMPLAINED SMOKE SMELL IN LAVATORY JUST BEFORE DETECTOR WENT OFF. FLIGHT ATTENDANT REPORTED NO INDICATION OF ANYONE WAS SMOKING IN THE LAVATORY. PERFORMED VISUAL INSPECTION OF RT LAVATORY LIGHTING SYS. NO EVIDENCE OF SMELL OR SMOKE NOTED. DEFERRED RT AFT LAVATORY SMOKE DETECTION SYS IAW MEL 2607 S1 CAT C. M PROCEDURE COMPLIED WITH & PLACARD INSTALLED. COMPLIED WITH TASK CARD 21-059-002.