Today I was out on a call for a water heater not working. I got there and the customer asked if I had the parts that he needed, I asked how do you know what u need? Then I got the old " my friend from Florida does this, he was here this weekend (it was a motel), he diagnosed it as a s86 gone bad. I asked the guy " so I don't have to diagnose it, I just need to change the part" he said yes. So against my better judgement I swapped boxes and what do you know still no spark at the pilot assembly. Well it turned out the electrode cable was bad, the tech must not have pulled the cable of the box and checked at the source. Lesson learned never take anyone's word, see it for your self.