May Swami Ayyappa guide your path.
If you still need a PDF, search Google for: "108 ayyappa saranam" tamil pdf filetype:pdf — but always ensure the source is non-commercial and respects devotion over copyright. 108 ayyappa saranam tamil pdf download
I understand you're looking for a in Tamil, ideally as a PDF download, and you mentioned "deep write-up." May Swami Ayyappa guide your path