Ah, now I see I did not post my findings
The two shunt components, or at least the one near the input, measures >20Mohm, after desoldering the 16.2ohm resistor. Measuring across the other shunt component (with the rest of the instrument following it), measured 82 ohm, almost spot on.
I have absolutely no idea, what that high resistance component is. But it seems is not a resistor.
Same component used in different places, even near the P3 port.
If you look closely, it even does not look like a regular resistor.