Short circuit related to DOME and ECU-B fuses

I have a 2010 2.7L Tacoma with a parasitic battery drain. The current (~200mA) takes 4-5 days to drain the battery, but it's still a problem since the truck is my family's secondary vehicle. I found fuses DOME and ECU-B to be drawing the majority of the current, as well as a few other random fuses that I am not as concerned about (e.g. RADIO-B draws current for the clock). I looked through wiring diagrams for ages and eventually fully disconnected the under-dash fuse box, containing the body ECU. This caused both the DOME and ECU-B fuses to stop drawing current. I then hooked up a continuity checker and found continuity between the following male pins
:

Connector 1C, pin 4 (White wire from DOME fuse)
Connector 1K, pin 12 (Red wire to "Combination Meter")

According to the diagram, such a continuity shouldn't exist within the fuse panel itself. I also had the "Y" harness out that tied into the body ecu, removing it from the equation. It should also be noted that the test was preformed with connector 1C plugged in and back-probed, and everything else unplugged. (I was poking one end of the checker at the male pins of 1K one-by-one)

I am wondering whether the continuity confirmed above proves that the fuse panel itself is in need of replacement, or if the short may be caused by actual wire damage downstream.

 

I looked further into the problem, and found the short can occur with only connectors 1C and 1K plugged into the fuse box. Pin 12 on connector 1K isn't connected to anything on the truck I'm working on. However, pin 3 appears to be linked to a solid white wire. Do you happen to know enough about wiring on 2010 Tacomas to tell me where this wire goes so I can check if for insulation burning or cuts? Thanks

 

From what I understand, this circuit should draw current whenever the parking brake is engaged, and mine stopped drawing current when disengaging the parking brake. This means the switch is functioning normally. However, it is still drawing 200mA of current with the brake engaged and the key off (I would only expect to see 5-15mA on said circuit, just enough to tell the computer to turn on the (!) symbol when the key is on). Would this indicate the body ECU itself is bad? I'm certain of wire integrity since the switch can control it.