I have been called upon to assist a neighbor lady in fixing a problem she is having with her furnace. It is the same as my own, a 28 y/o Carrier (model #396GAW000075). It starts its cycle without any problems. After it has been running for about 10 minutes or so, the pilot ignitor starts to click/spark. The clicking gradually picks up speed and then there is a single louder click as if the pilot is trying to light (this is just a guess and I may be totally wrong as to what is happening at this point). This continues until the furnace turns off. I would greatly appreciate it if someone could diagnose this problem and how do I go about fixing it. I am trying to help my neighbor save a few dollars.