Very broadly information about the Space Shuttle is at: https://aka.ms/space_shuttlehttps://gandalf.azureedge.net/shuttle.html (If anybody knows the Docents for Endeavour or Enterprise in NY or LA please give them this link)
Information for the SSME which will answer some of your other questions: https://gandalfddi.z19.web.core.windows.net/Shuttle/SSME_MPS_Info/
So you do ask a big question, the answer is "it depends". I worked on the MPS/SSME system at KSC for many years, no engine processing flow was the same. First off after every launch the SSME's were removed to be taken to the engine shop for many many checks per the OMRSD (Orbiter Maintenance Requirements and Specifications Document). Some of them were "replace 'X' part after 'Y' flights", some were just "inspect ... part" ... But to inspect a specific part you might have to remove a flange, that flange might get scratched during the process which requires more work to fix ... Etc. Anyway, requirements document: https://gandalfddi.z19.web.core.windows.net/Shuttle/SSME_MPS_Info/SSME%20Test%20and%20Checkout%20-%2019980218686.pdf
Pages of checks, starting on page 34:
