While testing the main line, you'll have noted whether you have leaks in the lock side of the system, the unlock side, or both. This will help narrow down the problem(s). If you have a leak in the lock side, you can focus on testing only the lock lines which are marked with a red stripe.
If you have a leak in the unlock side you can focus on those lines marked with a green stripe.
If both sides leak, you'll need to test everything!