look at the whole top rim of the stair that is up against the concrete. that is leaking steadily and theres a ton of erosion and issues underneath them. I would budget for a full replacement of the stairs and a new liner, and it will also require the deck to be cut into and replaced. 10k would be lowside, 15k the highside. just patching or repairing will only buy you some time, they have been repaired before, and by someone who had no clue