Hi @panegyric13
It looks like a SOT-23-6 package, this list should at least get you in the ballpark of possible parts. According to this post, the U2 reference designator is calling out the 2nd integrated circuit on the board, which doesn’t give us much other than being an integrated circuit. Now that we assume it is a SOT23-6 integrated circuit, having the part manufacturer or schematic of the circuit would help narrow down options. From there, it would be a matter of datasheet diving to locate similarly marked parts.