820-00928-A not detecting integrated SSD after liquid ingress.

Hi again.
I have an 820-00928-A that does not detect the internal SSD.
This unit was apparently water damaged.
Another technician cleaned the board, unfortunately, so I cannot see where the liquid got onto the board.
There are no signs of corrosion anywhere.

Booting from a Monterey boot disk, disk utility fails to see the SSD.

I have cleaned and re-seated the metal plate on J9600, which appears absolutely clean.
SSD_PGOOD_L is 1.76v
I have tested all SSD voltages on page 84, all are exactly as they should be.

Edit. I tried heating the SSD NANDs and controller, as per recommendations on another post here, without any change.

Any other suggestions greatly appreciated.

Possibly ripped off components, if machine was in other repair shop before.
If all SSD power rails are good, then some signal could be bad.

Thanks again 2informaticos.
Sorry for the delay.
I had covid and was away from work.

I hope you are OK now.
I passed through Covid too...