As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAVATORY SMOKE AFTER TAKEOFF. FWD ALARM WITH SMOKE IN CABIN. PLASTIC ODOR. COMPLIED WITH JC 43L00021001. CHECKED THE FWD LAVATORY FOR DEFECTS. CHECKED THE WATER HEATER AND LIGHT OPERATION. REMOVED THE TOILET SHROUD AND INSPECTED. NOTHING FOUND. CHECKED THE GALLEY EQUIP, CABIN LIGHTING, FLT DECK EQUIPMENT, FWD E/E AND FWD CARGO. ALL CHECKED OK. OPERATED PACKS WITH APU AND ENGINE BLEED. CHECKED OK. NO ODORS PRESENT.