Pump Problem

[cschnurr]

The loose joint you tightened also should explain where the air was getting into your system to have bubbles.

You may want to start a new thread as this thread is listed as a pump problem, which has now changed to concrete problem.

I have similiar cracks, as well as some cracks elsewhere, in my stamped concrete deck. The PB told me the same info
Last year water got into these cracks and froze during winter. The expansion during freezing broke out some small chips which cannot be easily fixed. I don't know if you get freezing weather in the winter, if so, I would make sure I have a good coat of sealant on the concrete especially over the cracks.