Clip the remainder of the zip ties holding thhe transformer leads together and remove the screws holding the main PCB to the chassis. It's possible to complete the mods without removing the rest of the quick connects, but is much more difficult. If you remove the leads be sure to mark each lead so you can put it back in the right place.

Remove the leads on the top of the main board by C5 and R12( pic)

Remove the old components and install the new components as in the pic