Hello Guys!So, the story is that recently I disassembled my
Canon EOS 70D, replaced my broken shutter blades and did CMOS sensor position measuring and aligning after assembly using 0.001 mm scale.
Everything works fine, kinda... But my photos a little bit underexposed, they not that dark, but there is a slight push to the left in histogram.

As I know that means that my camera needs
Shutter Timing Alignment.
There is few possible ways to do this that I have in mind:
1. Bring camera to Canon Authorized Service;
2. Buy
SPT Software for $275.

What I understand it works directly using USB, it puts camera in to service mode and you can rewrite
Shutter Timing Value.
3. Maybe there is posibility to decrypt original Canon firmware file(.FIR), change these values and then compile it back and flash to camera. Or maybe there is a way to directly modify these values like that
SPT software does? As I understand it's not official
Canon Service software. Or maybe I need to extract firmware from my camera to be able to modify it... I just don't know... Just going thru this whole forum and wiki to find any kind of information about this.
I would love to hear your thoughts on this, maybe you know what's possible and what's not, every, even small bit of information will be really helpful to me.

Thank you! Hope this is the right section for this.
Jonas