Got it figured out. Too much fluid. When I looked with a bright LED flashlight, I saw a very small bubble in the top of the site window. Dad drained off 3 quarts and the bubble became bigger, so, job complete. Thanks for the advice.
Thanks for the responses. I went to my local dealership and compared an empty sight window and a full one. It's pretty obvious when it's empty because it is pure white. I'll apply this information and see if we can figure this out, which should be by this Sunday.
I own a 2010 L3700SU with a LA524 loader. I bought it second hand when it had 10 hrs on it in January of this year. The previous owner said he had the LA524 dealer installed instead of the slightly smaller standard loader. It just went over 50 hours and my dad just did the scheduled maintenance...