I'm working on a 2.5 ton rheem ac unit. There is a inline fuse after the transfomer and before the computer board. I have 124v on the line side and 27v @ the transformer. the unit will run for 12 hours then blow the inline fuse if it is replaced it will run for another 12 hours then blow. The transformer has been replaced and i'm still pulling 27v is the bouard bad or a'm I getting a voltage spike.