What was found
FL 180, TURNED ICE PROTECTION KNOB TO ALL, SMELLED A BURNING SMELL, POSSIBLY ELEC. SMELL WENT FROM COCKPIT TO ROW 5, NO SMOKE OBSERVED. COMPLIED WITH ETN-EM-72-034 & FOUND NO BURNING SMELLS. COMPLIED WITH INSPECTIONS IAW ETN IAW NRWC 824-ORD-01559.