As far as I understand and have always played. Using the blessing to repair a vehicle is not a shooting attack, it is just done in the shooting phase. So the rest of the unit are free to shoot at another target. pg 32 of the codex says 'if a techmarine is in base contact with any damaged vehicles during the Shooting phase, he can attempt to repair one instead of firing.' If does not say it is firing a weapon just that it does it instead of firing. This is also the case with assault as because it is not firing a weapon, the squad is still free to assault as normal. Because the vehicle was not shot at the target of the assault must be the unit the rest of the squad fired at or if they did not shoot any squad in range of assault.
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