I mentioned in another thread that I keep one of my two PSR 740s in the trunk of my car. Don added that I must not live in Louisianna because there I would have a melted keyboard. I like the convenience of keeping my keyboard in the trunk of my car. In the below freezing weather I have to bring my keyboard into the house because the LED is unreadable when the keyboard is cold. Does anyone have any knowledge of what summer temperature is too hot for a keyboard and could melt things?

In the passenger compartment I realize it gets super hot because of the greenhouse effect, and I would never keep my keyboard there during the summer, but I thought the trunk would be safe.