David Comment: Sorry there is no diagram. This is a very complex system of various proteins which had to be designed when DNA was designed. DNA repair is crucial for the survival of life. That there is more than one system indicates how important repair is.

Tony: The simple fact that it CAN be repaired, and IS repaired is enough to explicitly indicate design, from a purely informational level. Randomness doesn't repair or protect itself.

Designing the repair system along with the code itself is proof that a planning mind and forethought were present to do it.