What was found
SLC - RETURNED DUE TO SMOKE IN CABIN. SMOKE APPEARED TO DISSIPATE WHEN GALLEY PWR AND GASPER FAN ARE TURNED OFF. SMOKE DID REMAIN IN THE CABIN AND SMELLED TO BE ELECTRICAL IN NATURE. BOTH FRONT AND AFT LAV SMOKE DETECTORS WENT OFF SHORTLY AFTER WE SMELLED THE SMOKE. MAINT CHECKED OVENS, COFFEE MARKERS, CABIN AND LAVS AND ALL FOUND NORMAL. RAN ENGS TO T/O POWER FOR 5 MIN WITH PACKS ON, NO ODORS NOTED. AC HAD BEEN DE-ICED IN DEN, FLUID IN PACK AREA SLIGHT SMELL. REPLACED COALESCER BAGS AND WITH BOTH PACKS ON RUN, NO ODORS.