My 2008 gp gxp blue temp down driver side button doesn't work just the red arrow goes up to 90F now I cannot get the temp down. Blue down arrow toast.. last year that button required a lot of pressure to push it to drop the digital temp number. These things gotta be simple. I'm sure many had same problem as I am. How to fix???

My 1st post. Glad to be on the Forum.
Thanks
Derek!