Sager P870DM3 Almost Caught on Fire! What happened and can it be fixed?

I have a Sager P870DM3. It has the full copper plate heat sink. It originally had a 7700k (or 6700k) and was modded with the dsank BIOS and now has a 9700k, 2 gtx 1080sli and one 1tb SSD.

TL;DR
It seems that either the power supply or the part on the laptop you plug it in shorted. The laptop started smoking but was on and didn't seem different. the plug is ruined and so is the receiving piece. Best I can guess it was like this for 10 to 30 seconds before I yanked the plug and forced a shutdown. Is this part repairable? Should I send it to Sager or get it repaired locally? What do you think happened, has this been reported before?

The story
I have had the laptop for about two weeks (bought used) without any issues (like this). I have used it for games a few hours a day most days, and have left it running Folding at Home most nights. I monitor temps regularly.
Last night, I closed my game and started Folding at Home like usual. I usually underclock the GPUs in MSI Afterburner for this, but decided to let it go on full clocks for a few mins to see temps (which I have done before with no issue). Then I unplugged the HDMI and two USB ports (one near the power connector) and stood up. A few seconds later I smelled electrical burning and immediately unplugged the laptop and forced a shutdown (immediate, not through windows). That takes a second and MSI afterburner was open fullscreen with the graphs and I think it looked like it was still receiving power, but I could be wrong since it happened so fast. At most it was like this for 10-30 seconds. The laptop was defiantly smoking a bit when I yanked the plug, almost certainly from the power cord connecter. I may have bumped the power connector when I unplugged the HDMI, but I don't remember anything out of the ordinary and didn't replug it in.
I opened the laptop up about 5 minutes later and could not see anything odd. The battery was cold. On the power cord the connector that joins the two power bricks was hot from that cylinder on its cord up to the laptop.
Looking at the back of the laptop, the left two power pins have some black charred (probably) plastic around them and the right two have some sort of yellow stuff. The power cord side is similar.

Has this been reported before? I was really lucky I was standing next to the laptop at the time, I think it would have started a fire otherwise!
Obviously I need a new power brick joiner. Can the connector in the laptop be replaced? What could this have damaged? Should I send this to Sager or get it replaced locally?

Thanks for any thoughts.

 

Could have not been quite plugged in. If the PCB is undamaged the port could be removed and replaced though is a little tricky to source.

 

Allright. This laptop is way too expensive to give up. Should I call some Sager technical number to get some advice? I'm trying to figure out first steps. For all I know the cords and everything still works but I don't want to do anything too quickly and end up making things worse.

 

You can always call yes though from our point of view for absolute safety it will likely be recommended that you get a new motherboard. You could look to see if there is a local shop willing to assess and do component level repair on the plug.