[Elecraft] K2 LCD (Protective Film On Backside)

[randt]

#4877 k2 in progress.
My LCD has a light grey looking tape or film on the Back
with no lines or yellowing.
Page 27 in manual says(some LCDs (not all)may also have such film,with faintly visible yellow or gray 
diagonal lines.
Do I leave this on or take it off?
It is grey/white looking but no lines.
Please help me in my wondering.
Dont want to mess up now!
Kinda believe this is part of LCD.
kc4eyf
Thanks