Though not confirmed, the component, also seen on the 13-inch model, is thought to be an SSD diagnostics port. Also of note is MacBook Pro's gigantic Force Touch trackpad.

HP doesn't offer any ssd diagnostics tools for non HP OEM PCs. Unfortunately, I don't have a spare NVME SSD to image this to.

I've done a Dell system Diagnostic and the only fault is a dead battery which I've had for a long time. Memory test, Chdsk, sfc scan/now also all pass no repairs required. I've updated the system ...