The things in the yellow squares are resistors or chokes, they are not a concern. The transistors (FET's which do heat up) are just below those. This picture
shows where the VRM heatsink should be located (say's MOS_HS, just a generic picture, not specific to your board). In the upper right of the pic you can see the outline of the heatsink placement point which circles the 11 transistors there.
Hope it helps