Because if things get to the point that you think you’re going to need to run a level 2 diagnostic, then you might as well just skip straight to the level 1. Because if you don’t, you probably still aren’t going to find what you were looking for (or at best incomplete data), so you’ll still have to waste even more time running the level 1 anyway.
Otherwise the level 3 will suffice. It’s going to catch the large majority of issues just fine.
That’s not fair. He also runs level one and level three diagnostics.
But not level two. Never level two.
Why not level 2??? WHY???
Because if things get to the point that you think you’re going to need to run a level 2 diagnostic, then you might as well just skip straight to the level 1. Because if you don’t, you probably still aren’t going to find what you were looking for (or at best incomplete data), so you’ll still have to waste even more time running the level 1 anyway.
Otherwise the level 3 will suffice. It’s going to catch the large majority of issues just fine.
If you run a level 2 diagnostic, you have to take apart the entire warp core.
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If the shiz really hits the fan there’s 4 or, Koala forbid, 5. We can roundly ignore that one stray “Level 10” diagnostic from DISCO.