ECM Pin connector

[Mrkentee]

   First, the question: how difficult is it, and what is needed to fix/replace a pin in the ecm connector plug?

Now the details: I have a cel for oat (outside air temp) high voltage. Temp on dash reads correctly. No effect on performance. Sensor voltage is ok- 4.75. Insite says 5.2 volts. Replaced sensor, no change. BUT, when it rains the light goes out until it stops and dries up a little. Then light comes back on. I have experimented and gotten it to react. The other day, if I wet the single wire highlighted in the photo, it went out. Then dry it with air, back on again. I thought I nailed it, and replaced the butt connector, which looked fine. It didn’t fix it.
BUT AGAIN, while it was all loose, I could make the light go off and on by moving the wire. It’s pin #19.

Thanks