I used to copy/paste the “All references” to an Excel file every time I passed an xx44 count to compare it with the previous one. In that way I could see what had been added (or removed).
Now I have to copy/paste it in 15 lumps and then scissor them together. I started to do that, but it would never go past the two first 500 lumps. After 1000 there were no matches found.
BTW, I have never met a 503 error.