Changing fluorescent tube in an illuminated mirror

[Macdonsk]

I have a HIB Zenith Mirror (73105500) which was installed when the bathroom was refurbished back in 2016.

It has what looks like fluorescent tubes behind the mirror, down the left and right hand sides.

The one on the left has stopped working and i can't seem to find any instruction on how to access the inside of the mirror.

I'm loathed to mess around with it without knowing what i'm doing.

I've emailed the original installer to see if they can give me some guidance but in the meantime i though i'd ask here.

Anybody have any experience with this make and model.

 

[Macdonsk]

Thanks for the reply. The installer is going to come over next week. He said it's easier with two people and that it slides up but it can be difficult with only one person to hold and slide at the same time.

He has some spare tubes so is going to replace both and give me a couple as spares.