Current leak

Pay someone else to do that.

It's not exactly a common problem, so somebody has to do real diagnostic work.

 

An alternative to removing each fuse is to measure millivolts across each fuse. At 3 amps parasitic draw the millivolt reading will be very high.

For fuses sizes up to 20 amps a 3 amp draw will create a 10 mv or higher voltage drop across the fuse. A larger fuse will read greater than 7.5 mv.

The real skill comes after determining which fuse is feeding the draw. At that point wiring diagrams are usually needed to narrow down which load connected to that fuse is causing the draw.

Normally it's an aftermarket device or a hatch light staying on.

 

I think you have better results from tracing the draw,
instead of asking us to guess.