So, My rail pressure is dropping very quickly from 120 bar to like 7 bar when engine turned off.

I have swapped out fuel rails and injectors with a set I had laying around...still drops quickly but not as quick.

I don't see any external fuel leaks.

I do have faults, P1d2a09, p008792, p04200, p04300, p219062, p218862

So the fuel is leaking from somewhere.