I was cleaning some corrosion & gunk from a 1697 controller MCU Board and removed resistors R17 to R20 near the left thumbstick. It looks like this circuit is related to the rumble motors and replicated on the right so I can get values for the 4 missing resistors by measuring R25 to R28 (I'm guessing they're the same as the left side. OK?)
However, U4 (on the MCU Board) looks a bit corroded as well so that might need to be replaced. U4 and U5 are marked "455 10" but I haven't found anything after a Google search.
Can anyone identify U4 on the top of the MCU Board?