If it's electrical, you can unplug the bad injector and it'll run on 5 cylinders.
I did that when my injector 5 was shorted on the common wire for bank 2 (4 5 6).
But this case he had a mechanical problem of leak down, where the injector was leaking to the return lines. That shows up as a rail pressure issue, because the pump can't make the pressure.
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