4WD issues- no drive no indicator

So I’m new to the side by sides I just got a 13 1000 LTD. this weekend I was playing in mud and noticed I had lost the 4WD, I’ve got noting going on at the tires and I don’t have the indicator coming on on the instrument panel but my switch is lit up…so where do I start and does anyone have a good diagram or anything as even getting the body panels off seems a chore?