What was found
F/A REPORTED, LAV SMOKE ALARM ON F/O SIDE WENT OFF AND WOULD NOT STOP. SMELLED SMOKE LATER, REPORTED IT SMELLED ELECTRICAL. INSPECTED RIGHT AFT LAV, NOTHING FOUND. REPLACED SMOKE DETECTOR, WATER SEPARATOR BAGS AND PERFORMED CROSS OVER DUCT BURNOUT PROCEDURE PER M/M 36-10-00 PG 507 TO 508, RAN PACKS AND ALL CHECKS OK.