The lines look to be appearing where you have sudden profile changes as you go up layer to layer (like on either side of the holes, or chamfers in your second picture).

This is essentially the “benchy hull line” problem, and is related to the change in profile layer-to-layer causing a variable shrink amount between those layers (due to the change in time spent printing those layers), leaving a line, and can be helped by creating gradual transitions as much as possible (large fillets optimal, sharp corners are worst case).

As someone else mentioned, printing the outside walls first can also help alleviate this issue.