Thank you Malcolm. Very grateful for pointing me in the right direction. I do in fact have access to an entire suite of rework tools.
The PIC(s) are another story. Digikey, Mouser, Newark, Future, et. al. show 0 stock. Microchipdirect shows 30 April. Nonetheless I will reach out to the Microchip FAE and and ask for her help. Let's see what happens.
The diodes that isolate the Tx lines are also blown. Those are widely available (1N914) but I will replace them with a small-signal Schottky diode (30V @ 100mA).
There is no reason to drop .70V across at 2mA. The SD107WS-7-F exhibits only 300 mV at 2 mA when forward biased.
If I repair the controller, I also plan to design a fully bidirectional galvanic isolation stage for it to completely isolate the mount-based electronics from any 'electrical disturbance' (aka self inflicted pain), so this problem NEVER happens again.
I will place PDF schematics, BOM and the PCB Gerbers for everyone to implement, and make it available in this thread.
Did you see my email reply to you about TFS?
Thanks again