I have 30lbs of compression in cylinder 2 and 0lbs of compression in cylinder 4. I performed a leakdown test and Cylinders 1,3,5 & 6 were holding at less than 6% Both 2 & 4 were at 90%. Cylinder 2 showed leaking from cylinder 3 spark plug hole and Cylinder 4 was leaking from cylinder 6 spark plug hole. Cylinder 4 leaking to 6 does not make any sense.

Any thoughts?