Welcome to the forum. The pressure increase is due to the filter catching stuff and plugging. Simply doing what it is supposed to do. As for the bubbles in the pump basket, they usually should just pass if the flow is high enough. If the flow is reduced for whatever reason, such as a plugged filter or a pump on low speed, there may not be enough flow to clear the air out of the chamber. No big deal. However if there is an ar leak then it is a problem. As for the repair leaking, yes water would leak out with the pump off but with the pump on it would suck air. Keep in mind that even a physically small leak spot will allow a lot of air to enter but maybe not much water to leak out.
Hope this helps.
Al
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