The good news is it doesn't seem to be GP-related, as newly-imaged PCs don't seem to be affected by it. So just leaves our currently-installed base to fix. Obviously reimaging ~350 is out of the question if I want to have a job.
I'm fairly novice as Windows Update is concerned, so bear with me.
edit: error code 80070643.
I've attached the CBS logs, and threw in Windowsupdate.log with them. Couldn't compress the whole CBS folder as there were ~80MB of .CAB files.
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