[ScottishColin]

The keys that do not work are all on one trace.

Here's a ZIP of my PCB.

I have continuity from the plug on the end of the wiring bundle to pin 1.

I have continuity from the solder joint of pin 1 to a carefully scraped area of the trace which I have circled in Red.

I have continuity from the other carefully scraped area of the trace which I have circled in Green to the relevant keypads.

I do not have continuity between the the Green circled trace and the Red circled trace.

Is it time for another carefully positioned wire between the two scraped off circled traces?

Colin.