As for bleeding air from system after repair, on any pumped hydraulic system you generally just cycle the system a few times, let it sit for an hour so aerated fluid can settle then cycle it again. With each run , sit , cycle more air will come out of the system.

There might be a factory bleeder but I'd have to see a shop manual.

As for a possible low fluid cut off switch, there might be one but tops generally don't have such a system.