Just posting some pics in case anyone is curious what's inside, couldn't find any pictures of the insides. I opened mine up because I wanted to take a look at the circuit to see if I could put over-ride switches in to make cutting-brakes out of the ABS unit.
It turns out no that probably won't work out, there seem to be redundant safety functions on the power rails in here and it's not as easy as grounding out a solenoid terminal. After getting really weird meter readings I gave up to avoid burning out this fairly expensive box (dealer has to re-program a replacement).
It appears there are two ASIC chips inside running the control, I believe one is a computer and one is a power-module which all the solenoids plug into.
I started out using a coping saw to open it but I broke off a crystal (luckily this part was an easy repair) when the saw punched through, be really careful if you dig into this. There are parts that extend above where you have to cut. I cut the rest off with a dremel cutoff wheel.
Once you get inside, you cannot further remove the board so you really can't analyze the circuit very well (which is mostly why I just gave up and glued the cover back on).
Now just JB-Welding the cover back on since it's a destructive opening process.
In conclusion, unless you want to get into really risky electronics hacking, there's nothing you can really do in here for mods or service, so you probably don't want to go through the work of opening it.