Very good write up!
What about sourcing the circuit board itself. Looks like the part number is 86114-60020. I found one for $180 located at the following site:
New Original Toyota Multi Display Board 86114 60020 134160 7330 Driver Board For Lexus Car Auto Replacement-in Replacement Parts from Consumer Electronics on Aliexpress.com | Alibaba Group
What about sourcing the circuit board itself. Looks like the part number is 86114-60020. I found one for $180 located at the following site:
New Original Toyota Multi Display Board 86114 60020 134160 7330 Driver Board For Lexus Car Auto Replacement-in Replacement Parts from Consumer Electronics on Aliexpress.com | Alibaba Group