Re-torque
Re-torque after extreme cold maintenance?
My estimate is that for the work done in the inflated bubble, or the hangar (they claimed 10C/50F was maintained), no special treatment required. This is good because these bolts and studs (QEC & LRUs) are loaded in tension and are more critical.
Anything done on-wing in the cold will have more items that are shear-loaded, less so tensile, and thus less influenced by the cold when wrenched.