I have a potted camellia sinensis which has lots of brown tipped leaves. Brown tips have been there for a good few weeks now, and I was advised that it had been over watered (the pot it came in had terrible drainage). I moved it to a new pot, with better drainage and have only watered it when the soil is dry at the top, but the brown spots are just very slowly getting worse. I had a peak at the roots near the top and saw that some of them are brown in colour rather than a pale white ish. I don't want to prune the roots unless I have to but I fear it is root rot and I'm going to have to repot again. I've attached some photos at the bottom. Sorry they aren't better quality, happy to post more.
PS - I wasn't emptying the saucer after water flowed into it initially, but have since started doing that. Also, I put an inch or so of stones at the Base of the pot before filling it with soil so I'm not sure the soil would have been able to soak any of that water up.