Oven wouldn't heat after loud surge

My wife heard a loud surge when preheating the oven one day. When I restored power, the oven wouldn't heat and half of the oven display would not light. Broiler OK. Range top OK. The oven coil was electrically open after having melted through itself during the surge. I ordered a oven coil from PartSelect, based on model #. Installation was simple and only involved several easy to remove screws and a couple electrical terminal lugs. I replaced the coil but the oven would not heat beyond 100°F. I ordered a new oven display from PartSelect. PartSelect described what display series is required for a particular serial number. The first 2 #'s of the serial # are the display series required for the oven. My serial's first 2 numbers were 1 and 7, but PartSelect offered only a 10 or 12 series. I ordered a 12 series display and the part was identical. When I removed the faulty display, there were clearly burnt regions of the circuit card. Removal and installation of the display involved a nutdriver, philips screwdriver and circuit card plugs.
I am not sure what caused the failure, the display or the element, but, in either case, I believe the cause is eliminated. The total repair costs were around $225 in parts. At the moment of failure, the oven was approximately 5 years old.