They’re trying to read a file called TPP-Metafile.xml, which is likely an index of links to the actual procedures (idk how the FAA API works, just an old pilot who’s now a network/firewall jockey) - as long as the index can’t be fetched, none of the files that index references can be fetched, if ya know what I mean.
Logical that it’s the issue from the report and evidence, educated speculation without knowing exactly how it works. I’m thinking the 2112 in the original URL is probably a reference to the cycle and now that we are on 2201 it broke.