Questions about Diagnostics & Proficiency Sprite Powers... Options

[Jonny Reload]

I've got a few questions about these 2 powers so if I missed something that was in later released errata, feel free to shut me up and point me to a link (IMG:style_emoticons/default/grinbig.gif)

Obviously Diagnostics has come under a lot of scrutiny for Smartlinks since there's no Errata saying yes or no to it but I was curious... What if a Technomancer decided to go the retro-route and use a Commlink. Does a Sprite performing Diagnostics on the Commlink give a teamwork bonus to the person using that Commlink? (Hacking, Controlling Drones, etc.)

Does Diagnostics have to be rolled for every Action you take or is it just rolled once and it grants you the bonus while the power is sustained?

Proficiency also works like Diagnostics if you already have the skill in Question. If Diagnostics can't give you a bonus using your Commlink, would a Tutor Sprite do the trick in the examples above?