phalaenopsis discolored leaves and roots

[RosieC]

The discolouring under the leaves is something I don't really know about. However I have one with the same thing and it does not seem to have been a problem the last couple of years that it's had it. It's not my healthiest Phal, but I don't think that's related to the couple of leaves with discolouration like that, I think it's down to root problems that developed when I experimented with it's growing medium