Success to report thanks to those on the board that offered advice. I removed the shorted door light and then checked the diode (actually 750 ohm resistor) and it was OK. I replaced the dor chime relay, which as advised was on a bracket attached to the brake pedal frame. I found it easier to access from the bottom, but while I had the dash out I checked all of the connections. Now lots of things that didn't work before do: interior light via driver's door, seat before key is in ignition, diagnostic display and buzzer when key is turned on, and the blinking seatbelt sign above the interior light. Thanks again, now I can hop on the plane tomorrow with piece of mind that the car is a-o-k.