Hafler 9130 power amp


I bought a nos power switch for my Hafler 9130. Can anyone provide me with instructions on how to install it? Thanks!
hooznwif
So the gain controls being bypassed is not only a good thing, but a primary tweak. Knowledge is power. Once again, THANK YOU! BTW, I completed the switch replacement in less than 5 minutes thanks to you guys and the amp is back in service. Have a great weekend. 
Glad we could help, including your peace of mind(re: gain controls).   HAPPY LISTENING(to both of you)!