Removing top of Yamaha Clavinova CLP 260 keyboard

Hi, I would like to replace a couple of broken keys from my CLP 260 and can’t figure out how to remove the top in order to access the keys. Appreciate any advice!

You will have to take it off the stand, turn upside down onto a soft surface, remove 4 screws at the corners, turn it back normanl size up and now you can lift the top off.