This is the part with a high risk to damage parts of the screen. I'm not sure if my performed steps provide the best procedure to you. My touch unit (digitizer unit) was broken anyway - so I did not care too much to keep it alive. All 3 pieces are glued with very strong adhesive to each other and are very difficult to separate.

Put the entire unit into an oven and heat up to 70 to 80 degree Celsius to soften (melt) the adhesive. Start on one edge to carefully lift up the LCD and remove it without bending it too much.

Heat up the panel again and remove the plastic frame. You may need several iterations to heat it up in between.

I will continue with further steps after my new touch unit arrived (digitizer unit).

I would appreciate if some could provide more techniques how to separate adhesive mounting.