If you've had this fridge for a while, and the problem has just started happening recently, then I would suspect that the battery that operates the digital display during power outages needs to be replaced. A similar thing happens on my 1994 vintage washing machines when the Nicad battery starts to go on them. If I unplug the washing machine to pull it out and do some repairs, the machine forgets all it's programming, and when I plug it back in, it's display just flashes all of the liquid crystals over and over again. Newer appliances have a different kind of memory chip in them that doesn't need electric power to remember it's programmed settings.
But, Dan O. is the appliance repair tech in here, so I'd wait to see what he says.
But, the fact that the display reads 88/-88 and the other stuff tells you something.
What's happening is that the fridge is sending power to ALL of the LCD's in it's display. That's important because if something went wrong and the fridge displayed the error message "15", but the repairman couldn't find anything wrong with the system "15" referred to, the repair man would have a way of checking whether the real error code was in fact "15" or actually "19" but one of the liquid crystals in the second digit wasn't working, thereby causing the fridge to indicate the wrong error code.
This way, the repairman can open and close the left door and see whether the display reads 88/-88 or 88/-86 to see if part of the problem is that the digital display is showing the wrong error code cuz one of the liquid crystals isn't working.
So, I can at least tell you that all that's happening is the fridge is powering up all the LCD's in it's display as a diagnostic aide.
But, the fact that it's doing that, and not giving you an error code, means that there's nothing actually wrong with the fridge. Most likely it's doing that just to remind you that it hasn't been programmed yet. For example, it doesn't know whether or not you want it to display the time (like a microwave or stove does) or the temperature in the freezer or in the fresh food compartment, or as a diagnostic aide, whether you want it to display the temperature in the area of the evaporator coil. And, whether you want that info in degrees F or degrees C.
Probably the fastest way to find out what you're doing to cause the fridge to do that is to just read the section about the digital display in your fridge's owner's manual.