Some of them look like either electric-corrosion (at best)
Or fully scraped away pins
Can you elaborate again how that accident exactly happened ?
Was the unit into the socket while fluid run into it ?
Such type of corrosion looks strongly like it was powered on with conductive fluid ~ somehow
It also looks like steel-wool cleaned
And then at the end like somebody scratched it with a screwdriver
Please with easy words, describe how on earth that event happend
I personally can't follow the shorted wording you use
Something vega, something melting, 180W . . . i have no idea what actually happened
At absolute best, these pads marked are just corrosion
The first 3 rows mostly relate to current filtering, or aren't used - well just for grounding
But the rows afterwards nearly all of them except lucky pins are used
The best advice i can give, is taping the first rows on which the PCB is damaged with electrical or capton tape
At least the first two rows ~ so you won't short the PCB
Then clean the rest with isopropyle gently, and or maybe look for non conductive non oily WD-40 "electrical spray"
There are many WD-40's
our socket might also need some cleaning if this appears to look like fluid corrosion