Current capabilities of onboard voltages

It would be good to know the max current you can draw from each port and especially the onboard voltages
For example:
1. Maximum current that can be drawn from all combined 12V ports that are fed from the onboard regulator
2. Maximum current that can be drawn from each port that can be fed from onboard 12V regulator (HE2, Fan0, Fan1)
3. Maximum current that can be drawn from the RGB 5V port

Start by locating the Rumba32 board schematic and the regulator and port specifications for the onboard 12V and 5V supplies. Verify the combined 12V limit, the limits for HE2, Fan0, Fan1, and the RGB 5V port, then document those values and their conditions in the project documentation.

Written by the indexing model from the issue text.