so......I've already reached out to the roofer and awaiting his callback.
Full tearoff, new shingles. A small piece of shingle was found after a rainstorm so I decided to climb up on check. Never did notice this in spring, when the job was gone but there are a couple of shingles that have areas that are missing granules and it's pure black. I suppose it was due to their ladders leaning on them.
Easy proper fix for a roofer though ?