Ok, so we'll do it like this, since they leave repair costs up to the GM. We'll handle it similar to vehicle repair. The cost in materials is 5%/point of armor that was degraded. So each time your armor gets pierced and was not from a called shot to an exposed area, then your armor degrades 1 point. The interval for the test is 6 hours, so in the downtime between UB's don't even worry about rollin for it. But for future reference i'll make it an Armorer + Logic (Higher of B/I values, 6hours) test. This reflects that the more protective the armor, the more complex it is to repair....because these bullet stopping materials are not just steel plates, they're crazy polymer carbon fibers and what not, and this needs skill to work with. Brick will also have to have at least an Armor Repair Tool Kit (500nuyen) to do the job at all.
To have a contact hook you up with someone to do the repairs make it a Charisma + Connection -2 if Contact outside of shadows (2) test. If you wanna look for it yourself make it just a Charisma test.
Cost of labor would be 100nuyen flat. So in this case i'll roll the test for and NPC armorer to see how long it took him.
Brick should have Ballistic Armor -1 from the bullets that pierced him, Zach should have impact armor -1 from frag grenade, and so should Stryker.
@Sichr:
Well, for the lock, if someone has Automotive Mechanics skill, they can remove it for you. If none of you have that, then you'd have to pay a guy to do it. He charges 15nuyen an hour. The mechanics test would be the same as the modification test but with the threshold halved, and no materials cost. Then it'll sell for 30% of market value, and it's used, so -20% of that, so we'll say it sells for 24% of the listed price.