It's an 820-00165 same as the 2015 board. Have you ruled out the trackpad, trackpad flex, I/O Board, I/O Cable, battery, and webcam as causes of the high fan speed? Run HWMonitor as well to see if any sensors report as bad.
Where was the liquid spill?
Usually trackpad issue; try known good board and flex.
Sometime caused by LIO board/flex.
On the MLB are various temp sensors too.
Depending which temps are reported with bad values in HWMonitor, you can make an idea about where to start...