The stuff they wanted to fix is fixed, the stuff they've been ignoring is still ignored.

Rear defroster and temp gauge fixed. They've still forgotten to fix the center diff lock. I told them to work on it. Maybe they didn't understand what I was asking, but I think they do now.

One week passes in service

Called the shop after a week passed. The part ordered from Mazda (rear defroster switch) came in, which had taken a long time. The 'easier' part to get, the engine temp sender, is still not in. The part, ordered from both NAPA and CarQuest were the wrong part. Part is now being ordered from Mazda. Still no progress on the center diff motor, they were supposed to look at it today.

Summer Service update

Looks like a $300 repair so far.
This includes replacing the sending unit for the temp gauge in the dash (the fan and water pump are controlled by a different sensor, or so I'm told).
The switch for the rear defroster is bad. New switch ordered.

No progress on the center diff.