What was found
WITHIN 5 MINUTES AFTER TAKEOFF AN ELEC BURNING RUBBER SMELL BECAME NOTICEABLE. SOURCE & LOCATION NOT DETECTABLE. ODOR SMELL MOST NOTICEABLE IN COCKPIT & SLIGHTLY NOTICEABLE IN CABIN. OPERATED WINDSHIELD HEAT & NOTICED THE LT WINDSHIELD HEAT WAS NOT WORKING PROPERLY. TROUBLE SHOT LT WINDSHIELD HEAT IAW FIM 30-41-00-810-901 & FOUND HEAT CONTACTOR L512DG TO BE INTERNALLY FAILED POSSIBLY CAUSING SMELL, WE ALSO FOUND WINDSHIELD HEAT RESISTOR BOX L503DG TO HAVE BURN MARKS INSIDE. R & R WINDSHIELD HEAT CONTACTOR, OLD & NEW PN 100CC1AY1, OLD SN 8724, NEW SN 102444. R & R WINDSHIELD HEAT RESISTOR BOX OLD & NEW PN FGFB641830A1, OLD SN 7084, NEW SN 7114. WINDSHIELD HEAT OPERATES NORMAL IAW MM 30-41-00-710-801.