"Patchmanager logging" means just filtering the systemd journal for relevant entries, as Patchmanager does not have any own logging facility, but writes lots of information to the systemd journal.

... which is:
devel-su journalctl -al _COMM=patchmanager _COMM=jolla-settings > patchmanager.log

Yes, that is what @coderus usually suggests, extracting all output of the components Patchmanager and Jolla Settings, but filtering may be adapted for specific debugging use-cases (and IIRC @coderus also has suggested amended variants).

If one is able to basically understand entries the systemd journal, I also suggest to issue a simple journalctl -r while having less installed, and search with "/" (for whatever you deem as suspicious) while using the keys Up / Down and PgUp / PgDwn for looking at the context of a search hit.
This way you may detect an offending Patch or setting on your own.