For some experiments I need to change the VCCBRAM source and connect it to a controllable power supply. I found the datasheet, schematic of the board and also datasheet of the regulator used on the board. But still have problem to find a good way to do that, although I found the regulator output that goes to the VCCBRAM but I cannot find the trace because it seems it will be in the inner layers on PCB. The other problem is that the source of VCCBRAM comes from a regulator which seems to be responsible for VCCINT and VCCPINT. any comments or recommendations?