MATRIX Mini-i Pro OLED repair

[Job]

I have a MATRIX Mini-i Pro purchased from Kidult Trading Co. in Nov 2014
Some of the OLED segments have failed.
Please let me if the OLED panel is easy to replace.
If so please let me where to purchase it.
Alternatively, where can I send the whole unit to repair?
I am in the UK
Thank you!

[Wei Cao]

Can you send us the serial number of your unit, so that we can tell you what to do next.