Just noticed my temperature display was reading 68 degrees
here in Jersey all morning despite the fact it was already in the 80s.

Should I have this serviced?

 

Mine too. Seems to be off by quite a bit sometimes.

 

Does the RL have a trip mileage reset button?

Yes this related to the temp display

 

So, okay, is there an actual fix to the temperature
display problem that anyone knows of?

 

you can adjust the temp +/- in the MID programming menu.

 

ASP,

I am not sure what you are saying here.

Is it just a problem where my temperature is off adjustment?

It seemed to me that it was showing the same reading all
day despite the temperature increase.

 

we are talking about the display beneath the gear selection (between speedo and tach) right and not the interior temp above the nav screen, right?

 

I am talking of the blue digital display on the
speedometer dashboard gauge behind the
steering wheel.

 

If it is off that much I would say take it to the dealer and have the sensor checked out. If it was only a couple degrees (and the reading changes) I would say adjust it yourself through the MID. But, in this case just go to the dealer.