Grammatophyllum leaf spot issue help! Please

[sustainabledee]

I purchased a grammatophyllum during an orchid exhibit at a botanical garden. It was big and beautiful 🤩
Now, 2 years later it's lost alot of leaves
Fortunately, it started growing more leaves. However it seems like there is a leaf problem...it looks like tiny holes. Starting at the back of the leaf primarily and I can see that some spots are showing through the top of the leaf in some areas.
This particular orchid has alot of sticky residue since I bought it. My research says this is normal for grammatophyllums.
I don't see mites. I think it may be a fungus or bacteria since the holes are about the size of the sticky dew that secretes from the back of the leaf.
I live in Connecticut (Northeast)
To water and clean leaves, I bring the plant in the shower and spray leaves and saturate big root system. It doesn't seem to help.