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1. Can he repair a building
2. If he fires the building's weapon (say heavy bolter from bastion) can he fire his othet weapons because of mechadendrite harness.

Yes, as they are treated as vehicles

I would say yes also, as it counts as firing one of the models weapons iirc, though it would have to be at the same unit.

I fully expected 2x "no"
But in this case, this is "the sex".

for when you get contested in the answer;

1. Buildings are transports that can't move (BRB 110) so yes
2. A model cannot manually fire an emplaced weapon and fire out of a fire point with its own weapons in the same turn.(BRB 112 Emplaced Weapons) . So this is an explicit prohibition.