Line 3 goes to the front to the N80 evap valve.
The charcoal can is equally as vexing to get to than the 'expansion chamber' on the other side (which is what Elsawin calls the big lump all the vent pipes feed in to). Arch liner out, then a bunch of hose clamps, although all stainless rather than the sad rusty lumps on the other side. Although, I had the left side arch liner out when I repaired the sill so that's like to come apart more easily than the right side.
It could be disconnected from either side tbh. I might try that before I get out the parts cannon
