bad news from your end...
There are two things that I would do first:
1. check whether your silicone seal is really sealing between the pan and the rear shield. That might be an easy fix relative to the other described hassle.
2. Make sure the inside of your computer is totally dry before you reboot it. If the main bord has a shortage the damage will be ugly. I placed my computer outside, high and with a healthy distance to the mill.