I needed to disassemble it to get dust out that was stuck between the lens and the LCD module.
That was succesfull, but I noticed that above the lens were 2 rubber gaskets and below the lens was none.

Is that normal?
The reason I'm asking is because it's 2nd hand and it could be that the LCD unit was taken apart and put back together incorrectly before I owned it.
I'm not sure if the 'gaskets' are intended to be spacers or as gaskets to seal off both sides of the lens.