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Check first if stays in Internet Recovery. If no data to save, try DFU restore.

Be sure to get same code termination; C00, B03...

In such case, both CD3215 chips should be bad; if your measurments are correct. Just in case, can you specify at wich capacitors found these readings? I hope battery was also disconnected.

If you can complete DFU revive (without errors), then data can be recovered in DFU mode. But this can be done only by Apple authorized service; connection to Apple server is required.

Is the power rail for CPU graphics, so may be adjustable voltage. We don't have detailed information for it.

"black probe on nearby screwhole and red probe on the caps" In diode mode, ALWAYS red probe on ground! https://boards.rossmanngroup.com/threads/how-to-collection.60974/ However, such low readings are bad, even in reverse way. I hope you've disconnected charger first.

Replace C7040. Be sure R7040 is good.

0.020/40 in diode mode is really bad. Be sure to check them properly.

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Some mechanical damage. Check for any ripped off component, damaged connector...

Check all secondary power supplies...

What 40 means? Maybe 0.040??? Which will be bad, of course.

PPBUS_G3H is always 0V? Check 3V3_G3H too.

You can replace with new, or one removed from other board (not exact same model).

Seems to have problems with A port. BTW, I said diode mode, not voltage.

First of all, welcome to the forum! Check diode mode to ground on pins 1 & 3 of J8500; w/ and w/o LCD assembly connected. https://boards.rossmanngroup.com/threads/how-to-collection.60974/

Any video/backlight voltage checking MUST be done with LCD connected. PCH expects HPD signal from it, prior to enable eDP output.

So missing internal video? In such case, check diode mode to ground at pins 1 & 3 of J8500. Is the lifeboat connector (J9600) closed?

Remove F5200 and check C5250 voltage. If steady, your problem should be somewhere else, not in the main power supply.

Go to an authorized Apple center. They should be able to pair new Touch ID with your board.