a while back we had an issue with lighting strikes, 40 year old building never had an issue the building owners had redid an electrical chase in the building and moved GROUNDS kept smoking all the boards in the duplex. so i would start by have someone check where the elevator is grounded. the fuses "should" protect the other side. they do make a voltage monitor that will check low and high voltage incase you do get a spike or a brown out. i think we got one from grangers, but i can't be sure might have been the local supply house. hope some of this helps? can i ask who is telling you the boards are going bad?