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We have mold in our basement , with mushrooms growing from the brick, what type of expert should we be talking to?

Hello, I was wondering if someone could point me to next steps: Over the last 2 winters a corner of my stand alone cottage garage concrete slab cracked and heaved. The garage sits on higher ground but doesn't have troughs or downspouts to move or direct precipitation away. The crack is large, it reaches approximately 10' in each direction and it exists at the back corner of the garage floor/slab. The tip of the corner has risen by approximately 1.5". I thought it may settle after last winter (when it heaved approximately 3/4") but that was not the case. I would like to repair and keep that slab. What should my next steps be for the slab? I'm thinking of hiring a concrete lifting service. I am aware that, besides the work inside the garage, I need to also focus on drainage around the garage, so this doesn't continue in the future. Thank you for your time!

There are two soft spots in my sunroom floor. I don’t want to replace the actual floor. Can it be repaired from underneath?