Reply to "Legacy GP-35 1933401: good in conventional but blue tooth and universal remote no longer work- is there an obvious board to replace?"

In a 2021 engine, it's most certainly soldered, they started doing that a few years ago.  The board were working loose and causing service headaches, so instead of keeping them modular and replaceable with a simple zip-tie, they made them a permanent part of the RCMC.