Hi, as the last person (Max) said you will need to remove the logic board again. Chances are that there are still some dried stains on that board in different spots (some lighter than others) and you will need to look at it in bright light. Slightly shift that board at different angles under bright light and look for any "trails" of stains, when you find them make sure you wet that small area with alcohol and the immediately scrub it with a rather stiff brush (a small thin tooth brush will do). After that then look at it again to make sure that the stain is completely gone then, look for other stains and then do the same again. This is not a full-proof-error free procedure because some components may have already been affected by the spill (some components are very fragile/sensitive when it comes to liquid spills). The coated electrical thin metal strips on the logic board itself could have already lost some of it's protective coating (which can cause an "ark"resulting in a random shutdown).