Ok - guy couldnt socket this, so it is hard soldered in place

Did the wire test before connecting the switch connectors
Column 51 is there, all the switches that were dead work ( I checked them AFTER what I am about to tell you )

Now, Column 41 is dead FFS  - this row was PERFECTLY FINE the other night.
SURELY this must just be a faulty ( new ) chip - by co-incidence?
I mean what else could it be.

Please bear in mind that I discovered 41 is dead BEFORE we put ANY switch connectors back on - I saw it in the wire test and couldnt friggin believe it.

Thoughts?