The BCnn components would be bypass capacitors. These provide local supply filtering at the various ICs. It would appear that the flash controller has an internal 1.1V Vcore linear LDO regulator and possibly an internal 3.3V linear Vio LDO regulator. The external 1.9V and 3.5V supplies would be for the NANDs.
Code:
BC02 1.12 1.11
BC03 1.12 1.09
BC05 1.12 1.11
BC07 1.12 1.09 Flash Controller internal Vcore LDO reg = 1.1V ?
BC08 1.12 1.11
BC10 1.12 1.09
BC11 1.12 1.09
BC01 1.86 1.88
BC04 1.88 1.86
BC06 1.88 1.86 Vio/NAND = 1.9V ?
BC13 1.88 1.86
BC15 1.88 1.86
BC09 3.3 3.24 Flash Controller internal Vio LDO reg = 3.3V ?
BC12 3.47 3.45
BC14 3.47 3.45 Vio/NAND = 3.5V ?
The capacitor which I suspected was the reset cap (C04) is sitting at +3.5V, so this means that the controller should have woken up. However, the 0V readings at C01 and C02 (USB 3.0 pins) would suggest that the controller may be brain dead. My next step would be to confirm whether Y01 is oscillating. Other than that, I wouldn't be able to do anything.