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Where was the spill?
Try first other RAM, one module at a time.
Clean the memory slots and inspect their solders close to the edges.
Be sure R7402 has the correct value.
Check for corrosion around SPI chip U6100 and inspect all its traces and SPI termination resistors.
You can also try new BIOS.
The PCH could got damaged by liquid.
Check all the lines which go from LCD connector to PCH; diode mode to ground.
Could also be a simple resistor, or even CPU.
Just in case, use good flux and heat PCH and CPU.
Be sure to get 25MHz from pin 9 of U2800.