MacBook Air won't turn on after topcase replaced. What could be wrong?

I have a Macbook Air 11" that had water damage on the power button side. I opened it, dried it out, but it still wouldn't start.

So, I meticulously replaced the top case (using a case from ifixit). I noticed signs of the spill on the bottom of the fan, but no further. My brief inspection suggested the motherboard is ok.

After reassembling, if I connect the power cord to the magsafe connector, the green charging light illuminates. I would have expected orange.

The Macbook still shows no signs of life. Has anyone experienced a similar spill?