ACC Unavailable Error MK3 FL

Yesterday, my 69 plate iV reported ACC is unavailable.

Normal driving, albeit in the rain.

Checked DTCs got 00791: Vertical alignment.

I've read on here Skoda can be arsey about charging for this, even though my car is still covered by Skoda-approved warranty and Service pack warranty.

I'd like to pop the cover off the bumper, to see if anything is amiss inside before I start the battle.

However, I've not managed to find any instructions on how to remove the cover on the FL model, I don't have the two holes to insert screwdrivers.

Has anyone taken the cover off an FL model that can share the process, please?