Pillowing on very top surface

Hi, I just can't figure this out. I had e pillowing that all of a sudden has started.

I printed a smaller similar piece with the same setting and it's perfect.

It seems to be on the top layer only. The other layers are immaculate.
The layer on top of the infill looks great.
Infill looks great.

Cf Petg. 4 too layers, 0.2 mm layer height.

I tried turning on he part fan to 45% as it was off before.
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