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Hi Everyone?

I’m a super newbie to bonsai (approximately 1 month). I have a Ficus bonsai that was bought for me as a gift from a garden centre in Yorkshire, England?and came with standard soil you get in garden centre bonsai.
I have been able to go nearly a full week without watering the tree and the heavy soil just holds onto the water and does not dry out, even on top.
Up until this week everything has seemed completely fine but I have begun to see some leaves beginning to yellow.
I have also found out through a small accident that I’m able to lift the tree from the pot with all the soil attached.
While the tree was out I noticed there were patches in the soil where there maybe possible root rot issues.
Other than the recent changes in leaf colour the tree has seemed healthy, has been putting out new growth and has been keeping its leaves.
My question is given that it is September would it be safe to repot the tree into some better draining soil?
If it is safe should I do any root pruning??
What is the best soil for ficus?

I’m sorry to ask so much on my first post, I just don’t want to do or not do anything that might cause the tree to die.

For context I have been putting the tree outside in a spot where it gets morning and afternoon sun throughout August and have been bringing it in and placing it in a window with the same facing on cooler evenings so far in September.?
I’ve added a few photos below.

Thanks in advance?

The roots looks healthy to me. No need to rush away and repot in the wrong time of the year.

If you're on the northern hemisphere, it's quite normal that the tree is beggining to slow down and yellow some leaves here and there...

Like Tropfrog said, roots looks ok, if you want you can complete a little bit of the substrate on top, but with substrate, no pebles or anything that block your view of the substrate, right now it is important for you to learn the timing on watering it.

The tree is enjoying some outside time, that's great.

My soil for ficus consist in about 1/3 inorganic and 2/3 of organic, so it can drain well, but also hold the amount od water ficuses need.

Have in mind that with less organics, more often you'll have to water it.

So, learn how to keep it, and prepare yourself for a repot by?next growing season.

Thank you for the advice. I really appreciate it.
This is a close up on a couple of leaves so you can see what I mean better.

Thank you so much. That’s great advice. Having no specialist bonsai shops near by it’s hard to get advice, so any information is really appreciated.