I had been wondering about how your dad was doing.
First of all...the 3 main items....events (AHI, Hyponeas, etc), pressure and leak...yes, ignore the rest of them.
There is a link in my signature for the glossary of the terms. It will help explain them.
The flow limitations and RERAs....unless these numbers are grossly huge all the time..disregard. By grossly huge...double digit indexes every hour, all night and every night. What you dad has is not alarming.
The one time the pressure bumped 15...there was also a bit larger leak than normal. Sometimes the Respironics machines will try to fix a leak with more pressure...sometimes it helps and sometimes it makes things worse. I would disregard that particular happening. The other parts of the night everything is well under control.
Also...sometimes even without leaks (though I do think this instance the pressure increase was related to leak) the events might happen to need more pressure than normal in rare situations. I have seen it happen myself. Sometimes the auto pressure line never moves..sometimes never moves all nights but a couple nights a week I might come close to the max (when I was using APAP I used to hit 18 cm) but the times are rare and short lived. I didn't worry about them. I just said that the events were on steroids..extra mean and extra strong.
So when I used APAP....10 min and 20 max...some nights it never budged beyond 12 cm but on a rare occasion I would see 18cm and even bump the max...Might be REM stage sleep related..might be supine sleeping...or combination of both. Might just be a fluke.
In your dad's situation..Nothing to be alarmed about and I really don't see the need to increase the maximum based on that one episode.
Hugs right back at you,