Isx Cm871 Injector leak test

[BC77]

Hello all. I preformed a injector leak test on my Isx. I got some air bubbles by cranking the motor and baring over the motor on the front actuator representing injectors 1, 2 and 3. The bubbles were between B and C indicating injector 1 is leaking. When I switched over to the back actuator representing injectors 4, 5 and 6 and preformed the test again, I got air bubbles while cranking the motor but none when I bared the motor over at least 6 complete revolutions. The air bubbles were very few on both test. Anyone have any ideas or suggestions? Can the air bubbles be caused by anything other than a leak?

Is there another way to perform an injector cut out test without having the software or do I need the computer to do it?

Thanks for any and all help.