MINI Cooper R50 - R53 Power Steering Pump Replacement

The MINI Cooper S uses a different type of power steering setup than most cars.
Rather than having the power steering pump driven by the engine belts, the pump is driven by an electric motor. While this frees up some power from not being driven off the engine belts, it also has a disadvantage. As the pump runs, it gets hotter and hotter. It is also located directly below the exhaust manifold, which adds to the heat problems.
The power steering pump on the MINI is one of those items that seems to have a bad reputation. In talking to many MINI owners, it seems that this is one of the more common items to fail on the car. In this article, I will go over the steps required to remove the old pump and replace it with a new one. HOT TIP: Now is a good time to replace the power steering lines as well (as they are known to leak.)
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[@ThePolechick]

A mechanic recently dropped my subframe to do some repair work, and now I keep getting air in the system, It’s causing a high-pitched sound and I was told to do the full lock only a few times and it would clear which it does. But then the sound comes back a day or so later. Do you think he has broken any of the hoses or clamps going towards the PAS pump and how easy would those be to change? I believe the pump is not at fault, It was perfectly fine until he dropped my subframe. I took it to a different garage and they said it is wet in the area. Fluid level After he did, the job was significantly lower than when he started it, I did top it up and it is not dropping any level. I am checking it every few days but I can’t bear the noise, I’m scared to drive it I case it’s getting damaged :(

[@pelicanparts]

Just confirm the fluid is not aerated. If not, ask what the fluid spec that was used in the pump. Might be wrong.

[@ThePolechick]

Yes, The fluid does appear to have tiny air bubbles in it, despite doing the full lock trick. The noise goes away and then it comes back again. The mechanic dropped the subframe, leaving the fluid reservoir dangling in the air on the end of the pipes, This made me double check the fluid when he had left, and it had dropped way below the dipstick, so I topped it up with the correct fluid that’s written on the lid of the reservoir. I’m just worried that he has knocked one of the clips or hoses, and it’s now sucking in air