The garage leaks, is the property obligated to maintain it?

If the property collects the garage management fee, it will definitely be repaired for you. Or the garage is in the warranty period of the building, and the property should be repaired for you.

If the garage is privately owned by you, there is no charge for the property. There is no obligation to maintain the property. However, you can find a waterproof company to directly grout the cracks (plugging agent), which is very low in cost and much lower than the cost of painting your car.