Working a handful of issues on a 2015 LR4 and hitting a bit of a wall.
Interested in some POVs from the group here on what may be next best course of action.

Batteries have been replaced (using GAP IID tool interface), parking brake was "stuck", released with manual cable, now functions as should.

My brain is taking me down a path to evaluated the wiring (possible mouse chews over the winter while in storage here in Maine, lots of poo and urine in the lower cavity of the main battery box).

Plan to check power to ABS module with test probe and establish clear / clean grounds for ABS module in wheel arch etc... where else would you start?

GAP IID readout on active faults below:
319 - LR4 2015
Vehicle scanned on 12-08-2024 13:04
Using IIDTool BT V4.0 B0098
ATCM-Terrain Response
• U0121-00 (2F) Lost communication with ABS control module
( on 12-08-2024 11:59:58 at 109990 km )
BCM-Body Control
• U0121-00 (2F) Lost communication with ABS control module
( on 12-08-2024 12:45:38 at 109990 km )
IPC-Instrument Pack
• U0121-00 (2F) Lost communication with ABS control module
( on 12-08-2024 12:45:34 at 109990 km )
IPMB-Camera
• U0140-08 (2E) Lost communication with body control module - General failure information - bus signal/message failure
( on 02-12-2028 00:33:45 at 166 km )
PAM-Parking Aid
• U0001-87 (2F) High speed CAN communication bus - Bus signal/message failure - missing a message
( on 25-04-2021 03:26:56 at 10923265 km )
PBM-Parking Brake - Issues 1 and 2 cleared
• U3000-4B (68) Control module - System internal failure - over temperature
( on 12-08-2024 12:07:38 at 109990 km )
• U2002-92 (68) Switch general electrical failure - Component failure - performance or incorrect operation
( on 12-08-2024 12:50:04 at 109990 km )
• U0121-00 (2B) Lost communication with ABS control module
( on 12-08-2024 12:00:03 at 109990 km )
RCM-Airbag
• U0001-87 (AB) High speed CAN communication bus - Bus signal/message failure - missing a message
( on 12-08-2024 12:00:03 at 109990 km )
RLM-Suspension
• U0122-00 (AF) Lost communication with vehicle dynamics control module
( on 12-08-2024 12:45:36 at 109990 km )
TCCM-Transfer Case
• U0121-00 (2F) Lost communication with ABS control module
( on 12-08-2024 12:00:08 at 109990 km )
• U0428-00 (2C) Invalid data received from steering angle sensor module
( on 12-08-2024 12:44:02 at 109990 km )
TCM-Transmission 8spd
• P279D-02 (2F) Four wheel drive range signal circuit - General failure information - general signal failure
( on 12-08-2024 12:49:05 at 109990 km )