Water Leak - Damage

Hi my first post.
I have recently purchased 2004 Nuevo and just found water leak coming from status 530 aerial which I removed, stripped and re sealed, trouble is this must have been leaking for some time as the lower plinth on wall cupboard has swollen causing wood effect paper to blister. I have since removed the lower piece of wood which runs under cabinet, does any member know where I could get replacement piece of timber along with wood effect paper to cover the trim.
Any help would be appreciated.

Can you cover with a thin  white plastic sheet