Very useful thread and how-to! Thanks!
I had to change my handle because the mechanism in the button broke (wore out and one of the pins fell out).....I had to purchase the whole handle together to replace just the button. This how-to was perfect.
Also, my shift interlock switch is acting up/not working at all at times so while working on the handle I took the liberty of effectively bypassing the switch using the white button on it's side. I pushed it down, placed a screw in the open void (to not allow for the button to come back up) and taped it to ensure the screw doesn't fall out. Works like a charm now and I don't have to spend 75$ on a switch