I need help somehow identyfing these marked komponents

Semiconductor Discrete Semiconductor Products
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s-l1600
s-l16001200×1600 388 KB

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The ON Semi part marked U3G should be MURS340T3G. The part is currently on backorder, for similar options look here.

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The surface mount capacitor will have to be measured. Here are some digital tweezers that may be of interest.