Repairing a bunch of Hikoki and Metabo HPT NR1890DC nails guns. Problem is, they won't fire nails

I only ever get a maybe one of these guns in a month, but these last 2 weeks have been crazy, cannot keep up with the amount of tools coming in.
Ended up with 3 of these guns needing fixed this week, all NR1890DC guns from 2019. So may as well do them all at once.

The problem is normally always. They won't fire nails or won't sink the nails.
If they won't sink the nails home. It simply needs re pressurised.

But if they won't shoot the nails at all or won't start up, that's is when the fun really starts. It could be any number of problems, so the only thing to do is crack it open and have a look.

As nail guns go, I'm hearing very good things on these hikoki or metabo htp guns. Anyone who has bought them seems to alway give the same feedback. Powerful guns, sinks every nail, very reliable, and when they do fail and need to be dropped in for repair, the customers normally pick up a new one anyway before they leave anyway
They are that happy with them.
But they also give the same downside, very heavy, and have a massive stupid rafter hook on the side.

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@hikoki