Hi Guy,
There may be an easier way than opening up the computer. According to Lenovo, you can enable a key combination that will toggle the enabling of the touch screen.
[link|https://support.lenovo.com/it/en/solutions/ht507174-how-to-disable-the-touchscreen-on-a-chromebook|How to Disable the Touchscreen on a Chromebook - Lenovo Support IT|new_window=true]
The gist of it is that you enable keyboard debugging shortcuts, then pressing Search+Shift+t will turn the touch screen function on or off. Here's the relevant text.
[quote]# Launch the Chrome browser and type the following path:[br]
***chrome://flags/#ash-debug-shortcuts***
# Locate the debugging keyboard shortcuts and click ***Enable***. Disable is selected by default.
# Select the ***Relaunch Now*** icon to restart Chrome to apply the changes.
# After logging in again, perform this keyboard shortcut.[br]
***Search+Shift+t***
# This allows a way to toggle the touch screen on or off.[/quote]