Main partition nearly full, can't find the source

One of my servers in recent days has been using up more and more of the root partition, and not sure why Main partition nearly full, can't find the source It used to sit at around 70% used for months... but the past few days I've been getting notified that it is very low on free space. First notice was yesterday saying 89% used, and today it went up to 91%, and just recently have noticed it at 92%

This happened once before, there were a lot of core files in /usr/local/apache for some reason, removed those and everything went back to normal. So, I checked for the same thing today but nothing Main partition nearly full, can't find the source

So I ran:
du -m --max-depth=1

This showed the problem most likely in the /usr directory just like last time, but after looking at most directories in there I can't seem to find what might be taking up so much extra space.

Any ideas or places to look?

 

 

 

 

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