sampling start/stop button help!

[apok]

so i was about to purchase an sp-505 off craigslist but when I went to scope it out I realized that the sampling start/stop button was sorta stuck under the casing and only worked if you pushed like half the button and you couldn't push it to hard.

i was wondering if it's an easy fix since i don't know any repair shops near by nor have i ever opened on of these up.

any help would be awesome! thanks in advance!