Wise.
The fact that it has had a brake bleed suggests to me the brakes were spongy / long and air had to be blead out of the system. If there is no air leak in the system then the only other way to get air in the system is where the brake fluid has boiled due to overheating. This happens when the water content is high. The boiled water release air which then cuases the air lock.
If this did happen then definately a full fluid change is required.