I looked up your model number and the factory part number for the fan switch is, part # 704573
The PS2002868 you listed I believe is a partselect number. Did Jenn Air really give you a PS part number?
I checked with our affiliates, sears and two whole sale parts dealers I work with. All of them listed the switch as (NLA) no longer available.
I even looked on ebay for you, but did not see one listed at this time.
You maybe out of luck.
About how old is it?