Good luck finding a how-to / DIY on how to replace that hinge... it is a part that would never fail on a normal car.

Go slither into the trunk, unplug the wiring, undo the bolts and compare the driver side arm to the passenger side arm. But you're smart enough to have already done that, right?

 

Yeah, I figured finding any DIY or how-to's on this arm would be a difficult task since, like you mentioned, it is not something that normally fails.

Thanks for the input, everyone.

 

1. REMOVE LUGGAGE LOCK CONTROL CABLE PLATE
(a) Detach the 2 claws and remove the luggage lock control cable plate.
2. REMOVE LUGGAGE COMPARTMENT DOOR INSIDE HANDLE
(a) Disconnect the luggage compartment door inside handle from the luggage door lock control cable.
3. REMOVE LUGGAGE COMPARTMENT DOOR ASSIST GRIP
(a) Detach the 2 claws and open the cover.
(b) Remove the 2 screws and luggage compartment door assist grip.
4. REMOVE SWITCH BEZEL (w/ Power Trunk Lid System)
(a) Detach the 2 claws and remove the switch bezel.
5. REMOVE LUGGAGE COMPARTMENT DOOR COVER
(a) Remove the 15 clips and luggage compartment door cover.
6. REMOVE LUGGAGE COMPARTMENT TRIM INNER COVER LH (w/ Power Trunk Lid System)

2013 MY GS350 [12/2011 - ]; DOOR / HATCH: LUGGAGE DOOR HINGE TORSION BAR: REMOVAL
7. REMOVE LUGGAGE COMPARTMENT DOOR HINGE COVER LH
(a) Remove the 3 clips and luggage compartment door hinge cover.

Sorry. There's nothing in TIS specifically for the hinge removal. That is pretty much the closes thing