[C&P RV]

At the risk of stating something obvious that you may have already tried:
1- are you getting water from the water dispenser inside the fridge on the left side? Depending on how you winterized, the filter and coil of tubing in the back left of the fridge may have air in it
2- is the filter secure (ie twisted and seated)?
3- is the Ice Maker switch set to on? Try turning if off, then back to on and make sure the "paddle" that indicates a full tray is not stuck

And be patient, it may take an hour or so before you see anything as there may be air in the line inside the freezer section that won't clear until it tries to make ice.
Keep us posted please!! I have the same fridge and winterized ours by blowing all the water out with air.