Latest: Fault is in the drive shaft for the ignition switch. The "ears" on the shaft that engage the switch are damaged--one gone entirely, the other mangled. Equals new lock housing (ouch!), but that's an essential part, and this one lasted 28 years. A new one should still be working when someone inherits this car. Part's on order with Phil. I'll report on the installation and test when it gets here.
jb