What was found
AFTER TAEKEOFF PASSING 4000' FLIGHT ATTENDANT IN AFT CALLED TO REPORT AFT NO SMOKING SIGN FLICKERED AND WAS HOT TO THE TOUCH. ALSO SMELLED BURNING PLASTIC SMELL. GROUNDED - YES. UNABLE DUPLICATE THE DEFECTS PLASTIC BURNING ODOR THAT FLT ATT REPORTED. GVI NO DISCREPANCIES FROM BOTH LEFT & RIGHT SMOKING SIGN ASSY, AFTACP, AFT GALLEY BREAKER PANEL. AFT COFFEE + WARMER, COFFEE MAKERS, OVEN OPS TEST NORMAL. REPLACED 2 AFT SEAT BELT SIGN ASSY AND OPS TEST NORMAL AMM 33-25-00, AMM 25-32-01, AMM 25-32-03, AMM 25-32-33. MSUN 1070819 08/01/2025 RUNNING BOTH ENGINES, APU AND PACKS GENERATE NO ODOER IN 5 MINUTES. FUNCTIONS ARE ALL NORMAL, ODER NO LONGER PRESENT.