I remembered reading this thread and decided to finally do something about the loud fan on our S80600. The WeTransfer link above is expired.
Here is a link to the
SA023N9 on the Epson Japan website, though it says it's for the s80650, it worked fine for me to stop the fan.
大判プリンター「SC-S80650」のドライバー・ソフトウェアに関する情報を提供しています。日本国内のエプソン製品にアフターサポートに関する公式サイト。
www.epson.jp
The US Epson site only lists
SA011MBa, and it's unclear if it addresses the fan issue.
epson.com