No sign of water or corrosion on, or around, the TCM. I did do the RCM repair, while checking for loose connections all over the vehicle. The solder points were ready to fail at any time, so I re-soldered, and now they should be good for awhile.

I cleaned as many grounds as I could, and also cleaned the battery terminals. The battery shows 12.85 volts across the terminals. The brake pedal switch was recently replaced.

I'm tempted to pull the wheels and clean the wheel sensors and connections. All that brake dust must affect the readings a little bit. Also need to check the low brake pad warning switch(es).

If my problem persists, I'll call around and see which Chrysler dealer has the necessary equipment to read all the codes, and go from there.