A push button switch is a FUNGIBLE item. One is as good as the next. Any decent shop can fit a new push button for that power switch in less than the usual one hour of shop time.
My daughter spilled a small amount of liquid on the power button (crazily this power button is on top of the case) while the system was on, which then shut the computer down. I took the system apart and verified that the only place I could see liquid was on the power switch. The power supply itself is in the back no where near the button.