Leaf problem with V. citrinum hihimanu

[horton711]

Holiday Greetings.....

This is my first post and I hope I'm doing things the right way.

I am a neophyte orchid grower mainly having Phals and a couple Dendrobiums (sp?). The attached pics are of a Grammatophyllum scriptum V. citrinum hihimanu (sp?) given to me by a well meaning neighbor. It looked OK at first but over the last few months the leaves started to look awful. The plant is in a 6" clay pot with what looks like a mix of bark, charcoal, perlite, and spaghnum. It's located outside where it gets morning to mid-day sun. I have watered it when the media feels dry and have been feeding dilute fertilizer once a month.

I think I'm slowly killing this plant. Hope the pics are clear enough for an evaluation to get me on the road to saving the plant.

Please tell me any other info needed and I thank all who reply in advance.....