What was found
ON T/O, STRONG SMELL OF SMOKE/ELECTRICAL/SULFUR. RETURN TO LAND MCO OVERWEIGHT LANDING AT 200 FPM, LANDING WEIGHT 112.8. REPLACED BOTH COALESCER BAGS. BOTH CLEAN, NO ODOR. PULLED FLIGHT INSTRUMENTS, NO SMELL. OPENED C/B PANELS, NO SMELLS. FOUND BURNT COFFEE IN FWD COFFEEMAKER, STILL ON. REPLACED FORWARD COFFE MAKER AND CLEANED AREA. OPERATED ALL COCKPIT LIGHTING, UNABLE TO DUPLICATE SMELL.