I have a State Select Water Heater, I am assuming the pilot light has gone out as I have not hot water. What process do I do to see if this is indeed the problem before calling in a service man.

You may have a standing pilot light or you may have an ignitor system. Directions for lighting pilot light should be on heater

I have a State Select water heater which needs pilot switch and gas feeder line replaced. Serial number L04A087328. Im having difficulty finding replacement . Please lead me to correct sight for ordering parts needed to repair water heater

Please see above comment