Hello from Ohio

[tfdohio]

I am new to this forum and I am looking for advice about solving a problem I am having with an Oncidium that I inherited from a deceased friend's collection. I do not know anything about its variety. I repotted it in October 2024 in a commercially available Oncidium orchid mix. The roots were fine. It has not responded with any new growth since October. There are several stunted pseudobulbs that have not matured. Moreover, several outer leaves have turned yellow and completely drying out. It is in an east facing window that gets morning sun. I water it every 5-7 days with slightly warm distilled water when the top several inches are dry. I was fertilizing it weekly weakly with MSU fertilizer applied after a plain water flush. I have stopped fertilizing it and wonder if the drying of the outer leaves might be due to over fertilizing. I also wonder if the yellowing and drying of the leaves might be due to a nutrient deficiency. I am an orchid beginner and have 2 phals and a Tsiku Marguerite that are doing just fine. I would appreciate any help and advice that I can systematically apply to get the Oncidium pictured to start growing again. Thank you for any assistance you can provide.