What was found
FLIGHT ATTENDANTS REPORTED THE AFT LEFT LAVATORY SMOKE DETECTOR SOUNDED. FAINT BURNING ODOR IN CABIN AND COCKPIT. ENGINE ANTI-ICE WAS SELECTED ON. SHUT OFF GALLEY POWER AND UPPER SIDEWALL LIGHTS IAW QRH. PLACED PACKS TO FULL COLD. SMOKE ALARM STOPPED THEN CAME BACK FOR APPROXIMATELY 3 MINUTES. ODOR DISSIPATED. DIVERTED. FLIGHT ATTENDANT DESCRIBED SWEET POLLEN ODOR, NO SMOKE, THAT DISSIPATED. PERFORMED NOGO ODI. PERFORMED T/O ENGINE POWER RUN WITH NO SMOKE OR ODOR.