Roofer came back out and looked it over, sealed them with some type of clear water sealant, and said the flashing and everything looked good -- but they continue to leak and the leaks are getting worse with each storm.Question: how do I find the right person to replace these skylights?

I got a hold of the Seller’s disclosure and learned that the property had some stucco repairs done: On 6/25/2021, the Stucco Company did a Moisture Inspection Summary that reported back high levels of moisture in the walls, aged sealants, sealant separation, missing flashings, It was highly revommended that “a follow up inspection be done within 12-24 months after all repairs are compelted to ensure that the moisture levels remain within an acceptable level.

Hi Taylor,Free work in return for lowered rent might not be such a good idea.It would be Smart to go in person and see examples of the person's previous work (of the same kind you want done).I've seen (for example) gypsum board punched holes replaced that were  -->99.999% Invisible<-- and on the other hand, tub work by the same individual that was "childish" at best.I've had other instances of Handymen describing their work in various glowing terms, and according themselves with various (made up) glowing titles (master this, and certain grade experts)--claiming unbelievable past projects--who were no-shows or no-finishers.It's best to understand what the repair needs yourself, such as "Blue Board" or "Purple Board" and sealant XYZ vs just relying on statements such as I have done these for years--yes that may be true, but at what quality (if quality counts to you--it may not).You also may want to spec that you want the area left Broom Clean when the work is done, and make sure to provide a dumpster if there will be large demo taking place.Good Luck!

There is a slight gap between tiles and concrete with some worn off sealant, and I have no clue on how to replace the worn out sealant because I don't know what product it is.

But if it's in the adhesive of a  floor tile or in the sealant of a window.

I'm hoping the sealant works well but figure once I do that, it can't be treated with this enzyme product at that point. 

Pretty much seems to sums it up.A hammer + a nail punch and some tub and tile sealant might work.You don't want water getting under there.Good Luck!

I suspect, given what you described of the situation, that someone used a stainless-steel quick-connect gas hose kit to put in your range and didn't use pipe dope, or thread sealant, in the installation.

One item that I was curious to ask here is a swag for dealing with a roof leakage (see below) - is this just an easy fix just using sealant + repainting the interior or can be a more expensive item?

A skylight that's properly installed with the right sealants shouldn't have any immediate issues. - Be prepared for maintenance.